I'm not here to say it's cuz the rules, judging and the cage give wrestlers an unfair advantage. (which they do)
There is yet another, undiscussed perhaps unnoticed reason. Wrestler vs wrestler does not happen very often. Wrestler vs wrestler is more often than not very boring.
Striker vs striker usually means fireworks, submission vs striker is usually fun also, wrestler vs striker is a must see since if striker wins he can mix things up, submission vs submission is hit or miss but wrestler vs wrestler 9/10 is boring.
Being that wrestler vs wrestler is uncompelling and boring they hardly face each other which leads to them getting favorable matches against someone who may make the fight exciting, which in turn allows them to move up the ranks more freely.
Some nonwrestlers do move up the ranks while hardly facing wrestlers but it's not very often
Just saying 
^^^^ that
Tomas Andersson - wrestlers who cancel each other out often results in fireworks..No no it doesn't
Reed Rothchild - Turns into D level Kickboxing matchThis is what happens. Or non stop jocking for position along the fence
Wrestlers dominate because they most often control where the fight takes place and have incredible amounts of mental toughness.
There is no other explanation.
Chuckliddellstein -Got it wrong againkingkoopa -Yes, yes it doesTomas Andersson - wrestlers who cancel each other out often results in fireworks..No no it doesn't
wiggum - Wrestlers dominate because they most often control where the fight takes place and have incredible amounts of mental toughness.Silly lol
There is no other explanation.
kingkoopa -wiggum - Wrestlers dominate because they most often control where the fight takes place and have incredible amounts of mental toughness.Silly lol
There is no other explanation.
You are a troll.
sekundarburnes - let's do away with the cliche reasons for wrestlers' dominance (c level striking match, favoritism in scoring, blah blah blah) and just admit that wrestlers win because they're tougher, more physical, and specialize in a discipline that is proven to be, alone, the most overpoweringly dominant of all the martial arts. their fights may be boring sometimes, but the reason 6 out of 8 of our world champions are wrestlers by training, or wrestlers in practice (st pierre), is not because the judging criteria is slanted in favor of their style. it's because wrestling is the single best base-discipline for having success in mma.Except for the fact that wrestlers have historically had far more trouble fighting in a ring than a cage and except the for fact that with different rules and judging wrestlers have had less success than with the SAC rules and judging.
Favorable match making is yet another reason they mive up the ranks.
Its ironic that UFC tries to book itself as exciting and it tries to convince ppk that mma is UFC. Yet the cage and the rules cultivate stalemates and holding over actual fighting. Plus everything previously stated cultivates One dimensional athletes. Due to the rukes, judging and cage all it takes is wrasslin. Due to the boring nature if pure wrasslin they get easier match ups.
Self perpetuating, boring, lack luster divisions
there were good wrestlers in ring also wrestling is a combat sport and in many areas is the, or the top, combat sport of choice to go into so , there you go
Emperor Nero - there were good wrestlers in ring also wrestling is a combat sport and in many areas is the, or the top, combat sport of choice to go into so , there you goYes there were but it in the ring it wasn't the single dominating discipline it was evenly spread. There was no dominant single discipline. In turn they wouldn't get favorable match making either
Current judging values positions over what is done with the position (not sure why) , in terms of striking light jabs (standing or as 'keeping busy fake gnp') is scored highly , and in relative terms damaging gnp is undervalued and submission threats are not valued at all.
Holding against the fence and takedowns that lead to nothing are seen as 'stealing rounds' .
The scoring is custom geared to the only martial art that's goal is to achieve position and do nothing threatening with it. 
There is no domination that takes place by any one style. A pure wrestler will not do well on average in MMA. Modern MMA champions have always been good at grappling & striking arts. The dominance comes from the physical & psychological traits of the individual (attributes like mental toughness, work ethic, speed, intelligence & learning capability) That is why Hammer House wrestlers never fulfilled their potential.
"That is why Hammer House wrestlers never fulfilled their potential." What do you think their potential was, to never lose even fighting into their 40s?
Coleman was a UFC and Pride GP champion. Randleman was a UFC champion who beat 3 UFC hvwt champions in his day, Williams, Smith and Rizzo.
sekundarburnes -If its about closely resembling a real fight there should be less stalling and there should b no time limit.kingkoopa -sekundarburnes - let's do away with the cliche reasons for wrestlers' dominance (c level striking match, favoritism in scoring, blah blah blah) and just admit that wrestlers win because they're tougher, more physical, and specialize in a discipline that is proven to be, alone, the most overpoweringly dominant of all the martial arts. their fights may be boring sometimes, but the reason 6 out of 8 of our world champions are wrestlers by training, or wrestlers in practice (st pierre), is not because the judging criteria is slanted in favor of their style. it's because wrestling is the single best base-discipline for having success in mma.Except for the fact that wrestlers have historically had far more trouble fighting in a ring than a cage and except the for fact that with different rules and judging wrestlers have had less success than with the SAC rules and judging.
Favorable match making is yet another reason they mive up the ranks.
Its ironic that UFC tries to book itself as exciting and it tries to convince ppk that mma is UFC. Yet the cage and the rules cultivate stalemates and holding over actual fighting. Plus everything previously stated cultivates One dimensional athletes. Due to the rukes, judging and cage all it takes is wrasslin. Due to the boring nature if pure wrasslin they get easier match ups.
Self perpetuating, boring, lack luster divisions
i don't think we can use the most corrupt organization prone to fight fixing in mma (the largest ring-using one) as evidence of wrestling's failure in the face of a negligible difference in physical setting for the fight. i doubt any reasonable person on here would doubt that velasquez or jones would be any less good at destroying guys in a ring, kicks to a grounded opponent or no, than they are in the octagon.
i don't get your favorable-matchingmaking argument either. UFC just recently cut okami, fitch, volkmann, and every other troublesome wrestler they can get away with axing (or can't). the UFC goes out of its way to find and keep good or fun strikers (wanderlei, hardy,yamamoto) but the problem is that your exciting strikers nearly always fall to good wrestlers. forgetting the evidence that proves the exact opposite of what you claim, just ask what possible reason the UFC could have for favoring wrestlers
your point that the rules might need some altering is a fair one. however, stalling's a part of fighting. i'd rather see something as close to reality as possible, even if it's boring, instead of watching guys getting favors done to them by relying on standups because they can't learn how to get off the bottom or stuff a takedown. the occasional boringness of mma is a fine price to pay for its closeness to reality, and when you compare it to any other sport, it's really not boring at all
When real fights happen both guys are trying to finish and or win decisively.
As far as favorable match making. It's not like ufc is saying oh he's a wrestler let's give him an easy fight. Its more like oh he's a wrestler let's match him against some one who is likely to make it exciting. UFC wants exciting fights. Im sure theyd get rid of all boring wrestlers if they could. They cant though since alit of wrestlers have good records and beat good fighters who have other primary disciplines. Those records and wins however have more to do with the format mma plays out in and less to do with how good the guys actually fight.
Like the other guy said, everything about the current mma format benefits those who master the sole discipline that rewards position alone over anything else.
Bellator Fan - Guys from strong wrestling states have been training like professional fighters without the strikes from a young age. They are experienced in all the sacrifices fighters have to make while maintaining peak performance. Weight cutting, dieting, competing in front of people regularly etc.
Well put, even if it's from bellator fan.
A large portion of the best fighters come from Brazil a country not known for wrestling.
I think wrestlers excel because they go through a selection process that only allows the very best athletes and most dedicated/driven individuals to get to the top. D1 champs are much more tested than karate, judo or ju-jistu players. Remember most kids go into mixed martial arts to defend themselves, most wrestlers were already the toughest guys around.
It's the current judging. You get the takedown and stay on top judges like that.