What I saw outside of a team that played with no heart and no urgency, is a team that is on the decline. The core players are aging (33 +) and slowing down. Malkin looked off like he was playing hurt or something. Marleau was invisible and Hornqvist wasn't his usual self etc. Maybe you're right Sullivan has reached his expiration with those players? Maybe they stopped playing for him? Nevertheless changes are inevitable when you lose in the playoffs especially to a lower seeded team, so we shall see what the off-season brings.