The Wolves are a terrible offensive team, so the while the decline in Kassian's stats are offputting, they're not terribly disconcerting.
What I am more concerned about is Kassian's consistency. Whenever I watch him play in the AHL I always get the sense he is just a lazy player. Sometimes he is a dominant force, but at other times (too often) I see weak backchecking, a defensive liability and all around lack of effort. With the tools he has: the hands, size and decent enough skating, Kassian should be able to impose himself on the opposition. More often than not I'll see him just try to shrug players off with his body, one-hand the puck and then end up losing the puck or making a terrible one-arm pass.
The number will come eventually. And he still has a lot of potential. But I want to see him put in a more consistent effort.