I don't think hardness is the model of success. Skating is the new model, and teams that have had success, like Chicago, Tampa, Pittsburgh have all outskated and outskilled their opponents, without being overwhelmingly physical. The analytics people tend to believe that physicality is more of a trait of puck pursuit over possession. The California, Pacific style mixes both speed and size, but I think fundamentals win hockey over metrics, good special teams, and structure.
I think having a physical defense limits an opponent's speed, especially through the neutral zone, so the Canadiens should be able to generate speed as a consequence. Markov was badly exposed as being neither fast or sufficiently physical.
I think that there is alot of heart in the forward group, and players like Gallagher and Marchand are the new era of physicality. Steve Ott and Dwight King did not distinguish themselves in spite of being tougher players. With Shaw in the lineup, Mc Carron in the wings, there is some toughness needed when the going gets tough. Generate penalties with good speed and positioning, execute on the PP, use speed as a weapon on the PK, and that wins games, which is the ultimate goal.