I think this is almost easy to forget. We have some big boys, and they aren't pylons either.
Lafreniere is heading toward 6'2, 210 territory. His fellow first round classmate Schneider around 6'2, 215. Kakko should play at 6'2/6'3, 215ish. Chytil is 6'2, 210ish. Miller will play at 6'5, 220-225. Robertson 6'4, 220ish. A guy like Cuylle will be in the 6'3, 215 range if he pans out.
Then you have guys like Zibanejad and Kreider on the roster. Obviously they have size and strength to go with the skills.
This could be a very heavy and a very mobile team to play against in pretty short order.