He should be pissed off. He's been f***ing unstoppable this year, and the ******** arbitration system is designed to pay him more money for how many saves he gets. He didn't choose for it to be like that, but it is, and he has every right to be upset. Adding Papelbon doesn't significantly alter their chances of winning this year, but it might have significantly altered how much money Storen will make next year, and he has every right to be pissed about it.