He's actually performed at a high level before, none of those guys have. Career ERA+ of 112. You might be lucky to get 100 innings of 90 ERA+ out of any of those other options. Miller might be able to give you 150 inning at 100-110, and it wouldn't be ridiculous if he gave you 190 innings at 120 ERA+. What makes Miller more likely to be good than any of the younger guys? The Cubs made the playoffs the last time he threw a full season, he had major rotator cuff surgery, and he was terrible in his brief stint in the majors this year. Miller's terrible end of 2006 was still much better than any of the young guys besides Hill end of 2006. Nope. Miller: 21.2 IP, 1.71 WHIP, 1.11 K/BB, 1.66 HR/9, .232/.376/.402/.771 line against Marshall: 125.2 IP, 1.52 WHIP, 1.30 K/BB, 1.43 HR/9, .270/.356/.444/.795 line against Marmol: 77 IP, 1.69 WHIP, 1.00 K/BB, 1.63 HR/9, .250/.386/.482/.862 line against Guzman: 56 IP, 1.88 WHIP, 1.62 K/BB, 1.44 HR/9, .308/.416/.507/.915 line against Mateo: 45.2 IP, 1.62 WHIP, 1.52 K/BB, 1.18 HR/9, .288/.376/.475/.841 line against Ryu: 15 IP, 1.93 WHIP, 2.83 K/BB, 4.26 HR/9, .348/.419/.758/1.160 line against You didn't even put ERA on there or any of its derivitives-while not the end all be all, it still deserves to be on there as much as the other stats. Miller had the best ERA by far, and he had the best OPS overall with everybody but Marshall, who he had a slight edge with (and Marshall was known last year for keeping those other peripherals down by shutting down the opponent for a few innings and bunching all the hits and walks into one inning-which still makes for not a great pitcher). If all 6 were to start and get a full season, then it likely would happen that 1 or 2 of the young guys might beat Miller. They only fill one spot though-and Miller is the most likely of any one of them individually to do well next year.