As fate would have it, the Nashville Predators will skate into PPG Paints Arena on Thursday for a game with massive playoff ramifications. Once upon a time, Mike Sullivan’s greatest coaching performance came against those same Predators. His team was completely gassed and playing without its No. 1 defenseman, yet Sullivan guided the Penguins to a second straight Stanley Cup triumph. He joined Chuck Noll and Danny Murtaugh as the only coaches in Pittsburgh pro sports history to win multiple championships. Everything he did worked. Everything he said sounded a little more insightful and a little more intelligent than coaches’…