He was juiced out of his mind in K-1 his confidence was through the roof and he was massive, plus the big gloves helped his defence a lot. He's more agile now but he doesn't impose his will in the same way, his style changed a lot.
He got off steroids. End of
Of course! He's not a young buck and has MANY MILES on that body. It happens to everyone
Dude has been KOd/TKOd almost 20 times throughout his fighting career (MMA and boxing). He's 39 and can't pull the trigger like he used to... it's time to hang up the gloves.