I thought the opposite. Drugnelo showed more stamina and power in the championship rounds in the first fight. He also seemed to hit harder in the first fight. Clearly off the PEDs, but still benefiting from the long term effects.
The really sad thing about his choice to take PEDs is he's actually a very talented fighter. The degree to which that talent is artificial enhanced we will never know for sure...
Canelo clearly got tired in the middle rounds last fight and always has. Maybe Im being naive, but if he was on riods his whole career till now wouldn't he have shown even more signs of fatigue than usual?