As long as he doesn't lose confidence playing on the top line. He really shouldn't be playing with AM
But why not? He is not an 18 year old, and this will.be his third year in the NHL (first was very abridged I know. He did get a taste of NHL and playoffs and then an off-season to prepare).
He clicks with Matty
He plays a style that suits Matty and a playmaker (Marner or Domi)
He brings another element of size to that line
...and he frees up someone to help carry another line.
I really like Knies Matthews Domi as the top line.
It means we can spread Marner, Nylander and Tavares across the next two. I think we might see more balance and depth from Berube in line-making than we saw from Keefe.