Photo: Sarah Stier/Getty The NBA’s Sixth Man of the Year award celebrates a unique kind of star—usually a guy who's underrated but changes the course of games without hearing their name in the starting lineup. Some award winners were instant offense, and others became foundational pieces on championship contenders, proving that impact isn’t limited to the staring lineup. But not every Sixth Man carried the same impact. Some winners put up buckets on average teams, while other