Is Kahun poised — finally — for a breakout?

CRANBERRY, Pa. -- Dominik Kahun isn't the only hockey player to get traded and have to adjust to a new system.

And he's not the only one who doesn't know, from game to game, what line he'll be on.

Nor is he the only guy who can't even be certain what position he'll be playing from one day to the next.

Fact is, Kahun isn't even the only one on his line -- the line he's been on for the past couple of days, anyway -- who has first-hand knowledge of all those things.

Jared McCann, who centered the second line for Kahun and Patric Hornqvist during the Penguins' 2-1 victory against the Ducks Thursday at PPG Paints Arena, experienced all of that after being acquired from the Panthers Feb. 1, so he can…