It comes down to the Leafs dont have an answer for Pasta and Marchand and Boston has every answer for Matthews, Nylander and Marner.
Leafs are going to try and bully the Bruins, the refs will do what they always do, get suckered by the B's flipping and flopping around like they were shot by a 12 gauge and/or give the B's phantom calls. The Leafs will get down in the series, abandoned the fake tough guy routine assume their real persona, chickens with their head cut off running around with no structure and then lose in 4 or 5 games.
Leafs season will be over by May 1st.