There's two Hoffmans: one is kind of sleepy, stays in position, not working too hard and opportunistic (yet effective); the other is full on, pushing the pace, creating scoring chances out of thin air (truly dynamic). He was the former for most of the game and then the latter when he "woke up" after being demoted to Legwand's line. Who knows why he doesn't play that way all the time???
I think his lack of PP time is a direct result of the coaches wanting him to play consistently with pace and not be satisfied with the sleepy/opportunistic game. For someone with his hands, shot, creativity and quickness, there can be no other reason why players like Legwand, Michalek and Chiasson get PP time over him.