Koji was a very underrated pitcher for much of his career. He finally got recognition in 2013 , but he was always very good. Kimbrel and Jansen have kind of had parallel careers , with both reaching the 400 save milestone this season. It could be a long time, if ever, until someone else does that. Chapman is closest , but seems to be stalled. Edwin Diaz , of the Mets, might have the best chance . He is 29 , with 205 saves . He is currently on the 60 day I.L.