I agree about the fragility issue. Thats his Achilles heel. That said, for the past four years, 2012-2015 inclusive, he has averaged 145 IP with an average ERA+ of 134. Two great years; two bad ones. If you project his salary based on 200 IP (200/145x$13M) you come out at just under $18M/yr for a pitcher with an ERA+ of 134. Ordinarily that would be a great deal for the Red Sox, but because his fragility has additional costs (ie, finding someone else to take his place when he gets hurt) I think its just a fair contract. Basically, I agree with you: its not an overpay. I don't see a pressing need to get rid of him just yet.