Rex Ryan should cherish the time he spends with Darrelle Revis in the next 10 days as the Jets open their offseason conditioning program Monday. Their days together are likely dwindling to a precious few. Of course, you should never trade your best player unless you somehow get something like Dallas got for Herschel Walker from Minnesota (three No. 1s, three No. 2s, among other things) and that is never going to happen again unless it involves a franchise quarterback in his prime.