It's a game of inches at that level, and TJ made unbelievable massive jumps in technical ability after he was already an established pro fighter. That isn't normal. It's indicative of putting in an insane amount of extra training, without slowing down due to fatigue, so that he could develop the level of striking that got him to the title. He never becomes champion without it. Even with it, he lost to Cruz.
Lol at the idea that Jones is somehow exempt from this. He uses PEDs for the same reason as everyone else. He wouldn't be champ without them either. That's the entire fucking point of taking them, to do things that you can't do without them.