I think a lot of these LHWs could crack the HW top 10 easily. Being 255 or 265 isnt always an advantage as we saw with some of the match ups from the last UFC. DC was a top 5 HW before going to LHW. Fedor is the size of a MW. Rumble beat AA.
I think being bigger doesnt mean shit if you're a lot slower.
Taco muncher - Definitely a matter of who the 2 fighters are. Their skill level, their styles.
If the HW standing across from you is the Reem or JDS and you're only a LHW, different story!
JDS yes but Overeems chin is extremely faulty and I can see a few LHWs knocking him out. AO is extremely hit or miss but he has tools to finish the fight anywhere.
All things being equal, size plays a big part. Clearly a smaller man beating a bigger guy means the smaller gut is..... More skilled! Trophies for everyone!!
Why did Tito have such a problem with fighting up a weight class? He never did it as far as I know, even against smaller heavyweights, and Tito was a rather large light heavyweight. Heavyweights that would challenge him and told him just don't cut weight, he'd respond by accepting the fight if only the heavyweight guy comes down. Ugh. He just didn't want to get punched all that hard eh?