McAvoy had unrealistic expectations coming into this season and he's exceeded them, which I think is 7th player worthy.
Heinen has come out of nowhere though. I really like that he's a finesse player who seems to have great chemistry playing with grinder types. The wowy numbers for Heinen with Schaller, Kuraly, Nash, and Backes (yeah I know Backes is not like the other 3) are all pretty drastic. A lot of (especially young) finesse players look totally out of place playing with players like that and he seems to be able to elevate their play. If that's repeatable and not just a small sample size, that seems really valuable.