At his age, at his size? He's pushing to get twenty. There's pics of him from not that long ago. That much mass that quick is sane, maybe, if you're a younger gym rat. Most guys I'd say that kind of quick gain is impossible without assistance in his situation. But some people do have that kind of ability.

But he's also been fairly open about steroid use after injuries, and showed plenty of signs of it otherwise. That kind of history comes at a price, often cardiovascular. So you can only go so hard later in life without straining the heart when you try and add mass fast. Slow? Sure, totally doable without any more strain than anyone lifting serious would have. If he's artificially accelerating on top of pushing hard, and I don't know that he is, it would be dangerous.

Unless the last pics I saw were way older than I thought. I dunno, I'm going to look again and see if I can date them more accurately, if I can find them. If it's been a year since those, it's way less severe than I thought.

Edit: yeah, that was longer ago than I thought. He was around 240 at the time, and it was over a year ago. Totally realistic to add 20 in muscle without strain in that time frame. My bad