I think Dubas deserves some heat here. There is nothing wrong trying to support your young core with grizzly veterans, but the ones he signed never won anything. Thornton's whole career is nothing but playoff disappointment. Spezza looked better he only ever had one decent run in the playoffs.
Campbell being the answer for Andersen was kind of an iffy call as well. A 28yo goalie with 0 playoff experience, heck limited regular season experience, expected to goaltend for a team who was suppose to make a deep run. Campbell would of been fine if he was growing with the team a few years ago but it was clearly to much pressure for him right now. You could hear it in his voice in the post game interview and see it during his play in game 7.
Another thing is Dubas contract negotiation skills for his young guns, he failed on those negotiations.