I have a good feeling we get a lot out of him this year under AV.
Why would anyone have a good feeling about any player "under AV". AV is the master of taking a player with a certain skill set and trying to play that player in a role not well suited for said skill set. One simple relevant example is how AV misused Hayes last year trying to get him to be a 2 way third line center. Hayes is an offensive play-making center and a mediocre checker. It was a failure and Hayes had a bad season as a result.
I fear the same for Desharnais. Desharnais is an offensive center, even if not good enough to be top six. Wherever you play him you have to accept his best skill is his playmaking and vision with the puck. He will not be a impact checking center - even if that is what the Rangers need.