I'd say he already is, I believe he's getting more PP time then Grabovski, and it might only have been marginally but he also played more minutes tonight.
Grabovski is being used as a shut-down center, Caryle said it, so has Grabovski. A role normally given to Caryle's third line.
Grabovski & Kulemin only show flashes of dominance, each and every game a couple years ago they displayed these flashes, last year Grabovski still played with a fire in his belly, Kulemin started teeter off, now Grabovski's fire seems to have diminished too. Probably has alot to do with their reduced offensive roles.