Chuck was NOT winning the fight before Shogun caught him - not even close. He is not the fighter he was. That much is clear. That said, the primary difference is the competition level. When he was dominating, there was no one in his weight class that posed a real threat - save for Randy, but even Randy had a bad match up against him. When the UFC expanded and started bringing in some great strikers, Chuck found himself primarily outclassed. Rampage is one of the best boxers - not the most complete striker - in the class, and before Shogun blew out his knee, many people had him as the best pound-for-pound fighter in the world. He beat Wanderlei Silva, and he looked very sharp in the win. The loss to Jardine I attribute as a hangover loss. Jardine's an awkward fighter anyway, but I don't think Chuck had recovered from the loss to Rampage. Until that fight, he had been untouchable for a few years (in the UFC). I attribute his loss to Evans as a stupid mistake. Up until that point, Evans hadn't shown a good deal of punching power, so I don't think Chuck feared him at all.