I think the reason he always seems to be chasing the game with seemingly little to no impact is that he has very low hockey IQ. Just a very poor level of reading & evaluating what's happening and making sure he's in the right place and doing the right thing.
Last game he had the puck near the left wall preparing for a dump-in with 2 Leafs in front of him ready to chase it down. Instead of flipping it along the near wall/into the left corner for some reason he dumps it diagonally into the right corner .. Where a Panther d-man easily picked it up and got it out uncontested.
It's the little things like that play that show just how far behind he is right now. In the AHL I'm sure he'd do well, probably be among the team leaders in goals and do well on PP1. In the NHL, he's not a factor, anywhere, and it's showing.