Posted by ESPN.com's Pat Yasinskas
Depth charts in the preseason (particularly before a team even plays its first preseason game) are far from being set in stone. Most coaches like to give veterans the benefit of the doubt in positions that are being contested.
McCown's still in a heated battle with Byron Leftwich and I seriously doubt the Bucs paid running back Derrick Ward big money in free agency to sit him behind Graham. As far as Black starting at linebacker, it's possible because Angelo Crowell, who also got a big contract in free agency, doesn't seem to be able to stay healthy.