No, it means a couple of things (and I know what you were aiming at, wanker)...
- He won with a system that was very successful, as a head coach currently in the NHL, no one has won 3 cups with 1 team the way he has in recent years. He won with a system that is his style, but when the league started to change, he didn't seem to adapt to it and just stuck to it, you know...a stick-to-itiveness, his standard is the standard, we do what we do baby, he didn't live in his fears, but he sure as shit didn't acknowledge it either.
- To stay relevant in the NHL, you can either keep winning in the regular season like Dan Bylsma did, one of the most successful head coaches in the salary cap era was also one of the worst in the playoffs given the team he had, why? He could adapt in season but when the playoffs came, he couldn't make the adjustments, as a matter of fact, he was stubborn about making changes to HIS system, thinking it meant HIS system wasn't good enough, when in reality, his system was fine when given adjustments and planning (ie: Isles series, they took it the Pens with speed and grit, Bylsma refused to dress TK, when he was in, he was a spark plug, infectious to the roster, they won, he reverted back to his ignorance and they lost later on).
Sullivan suffers from that, sure he can fix things in season, shows willingness, but even lately, he's sort of been stubborn and more panic-y with his line-up usage and choices, like he can't commit to a style this team should be, a team with too many identities trying to be the identity he won the cup with 2x. The playoffs is where you earn your salary, getting in is a grind and a half, yeah, but the playoffs? That's where the coaches really shine. Are there really playoff disappearing acts by players? No, hardly. Kessel was considered a bad playoff player until he was a Penguin, why? He fit the coaching style Sullivan employed.
The last 3yrs, the playoffs start and Sullivan seems unwilling to make adjustments to the other team. He just does this "we'll play our game and we've been doing it allllll yeeeaaaaar!' sort of crap. It's the Mike Sullivan version of "grind'em bitches down" ignorance of my way worked before, so it's obviously not m.