Nope, I refuse to stop usada comments about Cain. Fighters have alluded to Cain specifically using PED. Even on Saturday Rogan called Cain's stamina unusual, and we haven't seen Cain's endurance since usada period started. Rothwell specifically told everyone to watch Cain's endurance once usada testing started.
Cain looked fantastic, but winning fight in 5 minutes does nothing to prove his looking term endurance. In the past Cain could maintain hectic pace for 25 minutes. Until I see at least 2 or 3 full rounds from him I don't think their is anything to suggest his cardio is as good as it was.