Come on dont be silly.
In the first Anderson fight, the chris got the takedown pretty easily, tried a sub but couldnt get it. In the second round he was breathing heavy and attempted two more takedowns but Anderson shrugged them off with ease. Anderson thought he was safe and started clowning but got laid out.
Second fight was similar, he was beating on Anderson for a whole round and in the second looked gassed, but then Anderson leg got destroyed so he won the fight.
Chris's cardio IS suspect.
Its also important to note that Weidman fought Galvao at 194 lbs, cutting those extra 10lbs can take a lot of out of a fighter.