All of the above. It doesn't have to be limited to one thing.
The player cannot remain healthy. It's not like he means to be injured, but that's a flaw that seems inherent to him, though it's the team's bad choice to think otherwise. The team made a mistake going after him, and their development processes are also highly corrosive to players of his archetype so it's hard to figure out why they'd even want him since they always try to develop these guys into something else entirely; and he spent years playing under Dallas Eakins, who is worse than AV on all fronts and leaves dmen isolated and brutalized in every game, hardly an environment where a young player rushed to the show is going to be able to figure out what works.