This postseason, as you no doubt have noticed, has been all about the shifting roles of relief pitchers. It has been fun to watch -- like watching history in fast forward. The transformation began with an old-fashioned decision by Baltimore’s Buck Showalter to keep his best reliever, Zach Britton, in bubble wrap because the game was tied, a decision Buck drowned with. It continued with Terry Francona’s dazzling use of Cleveland’s super-reliever Andrew Miller in high-leverage middle inning situations.