This post does the same thing with relievers, but this time there are going to fifteen pitchers. The original plan was to select ten relievers, but I realized that there were a number of pitchers prior to the 1970s who were swing men not fitting neatly into either the starter or reliever role. Some examples were Hank Aguirre, Al Benton, Johnny Gorsica and Hal White. The inclusion of swing men expanded the pool enough where 15 slots seemed appropriate.
In the article ranking starters, I noted that pitchers are more difficult to rank because their roles have changed dramatically over the decades and this is even more true for relievers.