While I don't know much about Steve I would say that drugs are a lot more common in pro sports than people think. If someone's livelihood, not to mention their family's livelihood relies on them being in the best shape possible, you can bet there's a pretty decent chance they're using. Especially if the sport calls for extreme size. You are right though, if you train your whole life to be a big, thick linebacker you're essentially perma-bulking, and likely to have gotten pretty near your natural peak for lean mass meaning that you could cut down to a very desirable physique. But if said person cuts down, and leans out at like 240 lbs with 8% bodyfat, it's not just because they trained hard for so long, it's unnatural.
I'll fill you in, anyone can correct whatever i'm wrong on, but he's an ex-worldclass powerlifter. Used to bench press godly numbers and was fat as fuck though but a strong motherfucker. Was in the hospital for a reason i can't remember and almost died. Was emaciated and lost all his gains. Now he's back at it, against all odds (assuming with steroids, i mean look at this guy). He still currently holds the world record strict barbell curl i believe. Strong as fuck and very entertaining guy. Got a great personality though, i'm sure he's a great guy in person.