he plays the same game as Shanny and Perry. Skates, shoots and fights. None of those guys were or are known for lots of hits. Not their job. their job is to put the puck in the net. that being said he is just 19. Yzerman didn't learn to play D until his late 20's when Bowman threatened to trade him.
Posts like this remind me how old I am. I actually remember Shanny in his prime. He was everything you could ask from a player. He hit a lot, fought, had a good speed, nice dangles, good vision and in general was a player any opposing team was afraid in many different ways. There were so few guys like him since then and actually only Bert in his prime is comparable (perhaps, Getzlaf of 2008-2010, Neely as well but that was earlier). If Mantha could be half of a player Shanny was that would be a steal.