Wouldn't having 4 SP slots make exploiting the SP/RP eligibility easier? The only way to completely get around that is by having nothing but P slots, or making only a couple SP slots and allowing weekly lineup changes.
only true way to eliminate the advantage is to make all slots P but then you'll still have the guys who stack up on closers. so in all reality theres no way around it, if i a guy wants closers, he'll get them.
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the only guys that come to mind that fit this RP/SP are Papelbon and McCarthy who don't have SP eligibility yet, and Joel Pinerio if he wins the Boston closer job. I am sure there are more, but i doubt it is going to be that big a deal
Last year off my head I know Schilling also had sp-rp eligibility. I believe so did Liriano, not sure.
Papelbon will lose SP this year but will get it quick if he sticks in the rotation.
Re closers, you're right that if someone wants them they'll get them. Think bout it this way though..if someone does that, that's less SP they can carry. It may carry them in saves but will also stand to hurt them in wins, for instance.