The rule is five years to play four seasons, although you can sometimes get two medical redshirt seasons if you miss two years to injury (Jess Settles did that at Iowa to enable him to throw some cheap shots around in the 1999 NCAA Tournament in his sixth year, and I believe Robbie Hummel of Purdue is currently doing it as well). But alas, you don't get two if you redshirted once by choice and then got hurt. If Bradley had some sort of medical condition last year that could be documented, then the possibility of the second redshirt opens up.