That's interesting... I think you're right about LBs needing to be quicker to stop passing more than running, since the freaking owners have done everything they can to make pass coverage and QB pressure illegal. One thing I can't agree with is that he just did juice to recover from injury. I NEVER believe anyone who says that's why they do it. I'll get more personal than I need to to explain why. This was 16 years ago.. Here we go:
I was always muscular and strong, but very lean... told I look like a wrestler (a real wrestler, like the sport). Could not put on a pound to save my life, regardless of diet or exercise. I didn't care that much... I lifted two or three times a week as a matter of habit and didn't play football in high school, so I didn't need to be big for any good reason. Anyway, when I was in college, a lot of my friends from HS were doing juice- a couple were football players, several weren't . Eventually I told my one friend who was getting it for everyone, "what the hell, get me a cycle of something that will let me get stronger and not just feel like I'm wasting time at the gym." I wasn't going to class, so I had to do something.

He gets me 10 CCs of testosterone and 70 D-bol pills and explained how to spread it out over 8 weeks. And so...
A week into it I started gaining a pound a day. It was mostly water and made my face and bloated and stupid-looking, but every day at the gym the increase in strength and endurance was incredible. It was unbelievable. You are right about how people can fuck up tendons by lifting more than the tendons can handle when you're on that stuff. I was careful not to do so, but I saw friends do it. I was laughing at how huge I was getting.
When I went off them 8 weeks later, it all started to go away... the water retention (thankfully) and the extra muscle.
My point is that the only reason I never took them again is that I didn't really care to begin with about getting big... I more or less did it for something to do, and everyone else seemed to be having a good time. Athletes who feel they have something to gain by it... when they do it once, which I suspect 97% of them have... there is no way in hell they are going to stop if there is any way they feel they can get away with it. They work too well. If they see their buddy doing it, they're going to try it themselves. I sure as hell don't believe the baseball players who say they only did it once. With that kind of money at stake? They did it until it became outlawed in baseball, AND they felt that there was a good chance of getting caught. I bet the Boz was on from late in high school. Just a feeling I have.
By the way, now that I'm in my mid-30s, I'm happy as hell to have this body type. I'm as strong and lean as when I was 21. All the guys who could put on weight that I grew up with are on their way to becoming fat fucks now. But I'll never forget how it felt to be a monster for those 8 weeks or so.. good times! "We'll always have Paris," as the saying goes