You do sound awefully jealous, don't you?
And with good reason!
No really, I think you make a rather weak case, actually:
There isn't something like "the best" juice. Nobody knows how their body will respond, so maybe Overeem can consider himself lucky but on the other hand he really trained hard with successfull strongmen and ate like a pro bodybuilder.
K-1 is a sport where more size is a big advantage - especially when multiple knees from the clinch were still allowed, something Overeem can do very well .
So it's fair to assume he wanted to get both stronger and more massive.
Did he assume he'll explode like that? No, but does he have to be ashamed for great results?
The juice is just one a extra factor, done in many pro sports not because it makes you huuuge but because you can train harder and rest better.
And it's not even illegal in J.
So it's both reasonable and for O. perhaps even a moral imperative; to ensure that his family will still have a healthy dad.
He is far from being just some LHW. He had a fairly long career with mostly spectacular fights, often against top 10 guys.
Also, are you sure the "UFC monsters" are or were always clean?
We know the answer.
And fourth, if he can be a superstar in Japan, good for him, he totally deserves it.
He doesn't have to prove anything to UFC fans.
If Dana won't make him a good offer, he should laugh it off as he swims in Yen and silken, s-size panties.