Here's the official details on the roster shuffling we alluded to earlier.
The Bucs indeed signed FB Zack Crockett and also promoted RB Kenneth Darby to the active roster. As a result, they released Lionel Gates from the active roster. TE Zac Herold took Darby's place on the practice squad.
The second active roster spot was available because Jerramy Stevens is suspended for this week and therefore not on the active roster.
The Darby move is a pretty good indication there are going to be some depth issues in the backfield on Sunday. Remember, Michael Pittman is still with an ankle injury.