He's 24 and has had at least 4 concussions already, along with some other injury problems. Really good player (fun to watch too), but next year is a contract year and I just don't think the Ducks were ready to commit big money, even if he finally puts a full healthy season together.
As someone who roots for them I worry we just sold low on a youngish first line winger but he's also not going to be worth this much if he keeps getting hurt.