At 15 years old, I was the best athlete on both my basketball and football teams. Strongest and fastest guy on both squads as far as I knew. Definitely the fastest and built well.
I was likely about 5' 10" and 170 lbs. Took tons of protein shakes, all that stuff. Lifted like crazy. All clean.
Brock's frame and muscle at 15 was definitely bigger than mine was. That is not a normal 15-year old kid there, and he's hardly "scrawny." That's a serious athlete with a frame that looks like it is going to fill out a ton once he stops growing taller and starts to grow thicker.
I'm not saying Brock didn't do PED's before he got busted at UFC 200 because I absolutely believe he did them before. And I know of guys who were in high school in the 1980's (like I was) who got massive gains from PED usage.
Still, let's not pretend Brock wasn't a great athlete with superior genetics. You can't become what he has become without having some incredible genetics. Most guys who weigh 300 pounds cannot move with the speed, explosiveness and agility Brock has shown.
On the other hand, if Brock has been abusing PED's for decades, then my guess is he won't be on the earth a whole lot longer. Maybe the diverticulitis was a sign of what is to come.
I hope not, for his sake and for the sake of his family.