we see stuff through rose colored classes looking into the past
truth is 2005 guys looked good against each other but they had very bad skill deficiencies that would get them demolished today.
cro cop was 220 lbs and had poor grappling. that was OK when the best grappler he would face might be Big Nog. We got guys like Brock Lesnar and Stipe today though.. 220 lbs and poor grappling just isn't going to cut it.
Top guys today are just on another level. Only guy who could compete with them is Fedor.
Lesnar would end like Ron Waterman, who was not worse fighter than Brock, at least equaly big and strong, but for the difference, Waterman knew submissions and submitted V. Overeem and Randleman with kimuras.
Cro Cop also beat Coleman, Randleman, Fujita, Herring, Barnett, Sakuraba, and Olympic wrestler Dos Caras & judo Olympic gold medail Yoshida in those times.
His problem next to mileage, were UFC rules and cage. You cant wear and tire him in long wire fence clinch in the ring, no fence dirty boxing, much shorter allowed clinch time in Japan, no big round space of octagon without corners to circle and move around and avoid kicks and manage distance.
Easier to defend on the ground with no elbows, easier to punish failed takedown with soccer kicks and knees on downed opponents.
Mirko`s size disadvantage was much more emphased in unified rules and cage, but could be much more compensated in the ring and Pride rules.
In Cro Cop`s case it was not evolution of HW division that costed him, it was change of rules and environment next to mileage and injuries.