I disagree, this is a pattern thats been going on for years.
For example, the Nylander jumping the zone. I said it before the season started specifically about Marner, but now Nylander is doing it alot too. Leafs are always blowing the zone looking for "easy pickings". If your constantly watching for an opportunity to jump the zone, then your head isn't thinking defense enough. It cost us the game 6, game winning goal vs Tampa years ago, when Matthews tried to get behind the D and Marner attempted the lob pass, only to have it be intercepted and Tampa score the gwg.
This past offseason, Broudreau actually called the Leafs out for jumping to offense too quickly and he said in the playoffs they pay the price for it because it doesn't work and leafs pay the price for it early in series.
The year before, Trotz admitted he didn't think the core was playing the right way for playoffs but said he thought they were beginning to learn.
Ovechkin infamously called this team out for not playing right before that too.