I get what he means. It's guys who step it up in the clutch. Score big goals at big times. Not every player can be "the guy" but if placed in the right role, they're perfect. Kessel as a main guy didn't work, but playing 3rd/4th on the pecking order it did.
Look at guys like Bobby Carpenter as a checker on Boston and NJ. Also guys like Tikkanen, Claude Lemiuex, and later Drury who saved their best for the playoffs.
If Lias Anderson is nothing more than a 2nd/3rd line tweener center regular season fine, but if he shows up i the playoffs, scores some OT goals, and shutsdown the opposing teams stars, that's a player you win with.