McAvoy developed into one of the best defensemen in hockey under Bruce.
The problem is that most of their prospects have sucked. You can't develop mediocrity (or worse) into viable NHL players.
I think one of the best ways to tell if the argument 'the coach doesn't develop players' holds any weight, is seeing what happens when prospects leave the organization and plays for another. Surely, if our coach mismanaged the player, then another coach and organization should do better?
Let's look at the young forwards the Bruins casted off during his time as coach.
Ryan Spooner- Not an NHL player
Anders Bjork - had his best season under Cassidy, can't score in Buffalo
Frank Vatrano - Found his niche, did better outside of Boston
Ryan Donato - Had a relatively decent season after going through two other organizations
Austin Czarnik - Classic AHL/NHL tweener
Peter Cehlarik - Not an NHL player
Jakob Forsbacka-Karlsson - Not an NHL player
Zachary Senyshyn - not an nhl player
Brett Ritchie - I guess he is a 4th liner in Calgary?
Nick Ritchie - Had his best goal scoring season under Cassidy and best PPG, crapped out in Toronto, now with the Yotes
Ondrej Kase - 20 games in total including the playoffs, went to Toronto and did well. Hard to fault the coach on this one
Danton Heinen - Had his highest points total under Cassidy, scored the most goals this season with the Pens. Crapped out of the Ducks. Is he an NHL player who found some consistancy or going to have another down year next time? Can Bruce be blamed for it?
Karson Kuhlman - nothing to see here
When you look at this list, and what these players have done outside of Boston, I am not sure what there was to develop here?
Vatrano, Donato, and Heinen might be the only players from this list where you COULD make the argument that maybe the coach could've done better. I wouldn't make that argument, but I can see it.
Looking at this list of forwards, I am left to wonder what are people thinking if they feel he could do better with this youth?