Imo, the reason for the decline is that he's no longer sneaking up on anyone. With the influx of NHL calibre/ready defencemen into the AHL he's facing the top defensive pairing each night because he is now a known quantity across the league. When you win a scoring crown team's have to start game-planning for you and I think this is the reason guy's like Panik, Connolly, and Tyler Johnson are out-scoring him now. Obviously, they have talent but when you are facing an opponent's 2nd pairing there are going to be many more opportunities for you than there might against the first.
28 team, pts only, Keep 9
Start 9 fwd, 4D, 1G
F: Bickell, Bouchard, Clarkson, Clowe, Cullen, Malkin, Roy, Silfverberg*, Zetterberg
D:Ellis*, Girardi, Kronwall, Martin
* free protection
F: Killorn, O'Dell, Shore, Stransky, Tarasenko