With the system the Bears run there isnt that big of a difference in the safety positions. The two positions are almost interchangeable. I look at it like this. As long as Brown is healthy he will be on the field and Manning, Payne, McGowan and AA will compete for the other position and they have a few guys that can jump in and play either position if someone gets hurt. With RMJ and McBride there is no use for DMan at CB so all he can do is fight for the other safety spot or platoon in as a sub.