As English isn't my first language, I'm afraid I don't follow what you said.
The logic I am using to base my belief that almost all pros in sports are using is that (1) it's an ultra-competitive, lucrative business (2) you need to outclass users in highschool upwards to get the ultimate prize (3) many leagues have such lax protocols that only idiots get caught (ie Ben Johnson) (4) the human race can't have evolved to such a ridiculous extent in one generation (5) many athletes are getting caught despite the ease at which one can avoid detection (6) FP Santangelo was using - it's a fallacy to believe only the buffed are using as some designer PEDs as many relievers in MLB prefer using stuff that allows them to recover faster vs get huge (7) the athletic prowess of pros awes to the point of disbelief.
It's my belief. Others have disagreed. That's ok. I am not singling out Brady, but rather stating that I believe almost all pros use. But, if one would want to play that game - it's not that hard. The precipitous rise, the body in college, the longevity...
In short : I think they all use, but Brady excels because he is also ultra smart and and he studies harder than others. But - to keep up physically...