Wanna know why Armia is called the one-man army? Because he plays like he's the only guy on the ice. He'll dazzle you with his puck possession, puck skills and maneuvering in tight, but he never passes to anyone and tries to do everything himself. Guess what happens after? He'll lose the puck. Most of the time, it amounts to nothing because he doesn't use his teammates. In the NHL, you can't play like a one-man army.
There's a reason why a guy with so much size and skill like him isn't anything more than a 4th line player on so many teams (except the Habs of course).