The teams that have set roles, are the teams with the best bullpens, and that's why they succeed. 2014-2015 Royals, 1991 Reds, they have set roles but they also have 3 top 10 RPs. You couldn't do the same with say the Tigers with Bruce Rondon, Al Albuerquerque, Joakim Soria 7-8-9. I guess now they can with their new Bullpen in Wilson - Lowe - K-Rod. But I'd still want my best reliever whether he's a closer or not against their best hitters, especially in a close, high-leverage game