Goaltending is clearly an issue, but the fact that goalies leave and thrive says it is a system issue. The Bruins this year have shown that if you have a solid system, that everyone knows, you can get guys to do their job and thrive. Zacha, Coyle, etc have been put into scenarios that were rare for them in recent times and because the system works, they do well. The Bruins have good goalies but they look even better in that system.
Ottawa seems the opposite of that. They rightly went down the route of acquiring top end talent (Stutzle, Sanderson) but then decided to change direction with grit (Greig, Boucher) then back to talent (Chychrun). The change of management may see this improve but I don't see what their identity or plan is, and they look like they want to be everything.