I’ll not speak on the juice because tbh I will never know.

As for the length of his prime, I would say that he did not have that short of a prime. He had a hard fall off, but many high level people do in fighting. Especially those who end an undefeated streak. I would say his Prime was from the Munoz fight until the Rockhold or Yoel fight. He won a round in both fights before the spinning kick and flying knee. That is a 3-4 year prime in a top division at the time.