I think it is a fair point to suggest the pace we play at is somewhat unsustainable over all 82 games. However, one of the most tangible differences between the MT era and CJ+new coaches is that:
A)We are moving the puck much, much better. Therrien would have the team work way way harder than they needed to with inefficient dump-ins and there was a distinct lack of quality passing/passers which led to sloppy play in the opponents zone. We would always fizzle later on as we couldn't match the unsustainable expectations of that idiot MT.
B)Julien has a deeper roster, lots more skill (even if its not elite) and he's allowing the players to use clean passing more which saves tonnes of energy. We are incredibly better in the neutral zone as well which is letting us save energy by skating all the way back to our zone which helps sustain pressure. Look how often the leafs were pinned in their zone because they couldn't get it past centre ice.
The team actually seems to have a real system now, one that reflects the modern NHL. I have confidence that while the energy will be difficult to keep up night in/night out, our system is way better for possession and efficiency.
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Also, Domi was excellent last night. He was drafted where he was for a reason, and I think he could be the guy to break out this year.