Sheahan had a down year last year for sure, so I'm guessing he would be in line for a bounce back, especially if he's playing with much better wingers than he was in Detroit. Also, he is in a contract year, so he will have extra incentive to produce. I look at his plus/minus last year and that is cause for concern. Since you've resigned Cullen though, your PK centers would be him and Rowney, so that makes this move a little easier to do. Without Cullen, you are counting on Sheahan in a PK role, and I dont know how well he does there. The deal is fair though, I think.