I don't know the NFl has to give baseball a run for their money. Think about this. Pitt just won the super bowl. 20 of the pitt players had previous super bowl experiance yet Pitt was in the super bowl just 4 years ago. So on the 53 man roster at least 33 of them weren't there just 4 years ago. So at least 63% of the roster is differant than just 4 years ago.