I'll go with most of the thrust of your post. Steroids, more muscle mass than his body could support. Don't know about the weights causing shoulder joint damage. I think Bosworth was already one-armed when other NFL teams decided to run at him, and ran to his limp-arm side. Plus, it's hard to shed 300+ lb blockers with just one arm. Forcing him to cover, that sounds like hearsay. Got any video breakdowns showing Bosworth was crappy in coverage? Absent that, I'd classify it as piling on. Bosworth was pretty speedy for a LB. I can see classifying Bosworth as a steroid cheater, and his body was bound to fail him. IMO, neither a villain nor a hero, just yet one more guy whose body couldn't hold up to the demands of NFL play. The NFL scrap heap is littered with thousands of those guys. Gale Sayers, Greg Cook, great players who played in the NFL before knee surgeons could work magic. Even Curt Warner is on that list. Bosworth had a few good games while his body lasted. Agreed, he is a cautionary tale.
If you or anyone is a true Bosworth hater, I recall seeing an interview where he seemed to say he got trucked in divorce court far worse than anything Bo Jackson ever did to him. However, I can't confirm that, it seemed his ex gave him joint custody of the 3 kids and represented herself rather than using an attack divorce lawyer. Even if she got half his NFL-earnings assets, most of us could live OK on the remaining $4 Million. No tears for Bosworth here.
I'd like to think that in this day and age, Seahawks scouting and drafting would identify and rule out acquiring players whose bodies, just based on numbers and dimensions, are unlikely to hold up to NFL combat. Probably though, attractive prospects with questionable sturdiness would get UDFA invites rather than draft capital because you just never know. John Ursua comes to mind. Smallish Spoon plays out of his mind for his size and has been durable thus far and worth the draft capital.
Back to Bobo and Young, sorry for the thread meander. Bobo's suitability for the NFL is questioned based on his seeming lack of speed, rather than body fragility. I recall Steve Largent's "slow" speed for an NFL receiver being questioned. Then Ahmad Rashad and NBC showed a picture of Steve Largent "outrunning" Louis Wright, Broncos cornerback and one of the fastest men in the NFL, Largent 10 yards behind him catching a pass, and decided Largent was fast enough.