As last night showed, Nelson fell off the wagon 10 feet further than Crocop. How can you argue that Mirko was passed prime 8 years ago in the first fight when he demonstrated that he was 10x more athletic than Nelson last night?
Another question, how good would prime Nelson be in Pride considering his easy wins over cop and nog?
Cro Cop didn't fight those fights in boxing ring and Pride rules, those fights were in american rules and cage that did not suite him, that took away many of his tools, and gave advantage to his opponents.
Space in the cage is too big and too round and it allowed his opponents to keep out of range, and to circle around and away from his power, and move all the time so he could not reach them and set up kicks.
Look at Kongo - Minakov fight where Kongo was escaping around enitre round for 5 minutes and Minakov was chasing him and could not reach him because space is big and round.
Boxing ring is a lot smaller square space with corners, and opponents could not evade and escape there, Cro Cop forced them to toe to toe combat by ring cutting and closing into corners.
American rules are wrestling crap with wire fence pushing and clinching, and safe wrestling where you can shoot takedowns safely and opponent is forbidden to punish you with kick and knees on the ground. Ropes in the ring are flexible, they allow movement of legs, squatting and crunching to defend takedowns. Ropes are about breast-high and they leave upper body and arms free to act and punch. It is easier to exit clinch on the ropes.
Cro Cop simply had bad luck that ring MMA dissapeared from the big scene in 2007, and he had no option but to fight in american cage and american rules that did not suite him and gave advantage to his opponents.