I think he's waiting for someone to blow a knee in camp. The guy wants to start and for some reason, the teams needing starters addressed them pretty quickly without including Brown. Right now, he could go sign somewhere to compete for the starting gig (GReen Bay, perhaps) or sign somewhere as the #2 and hope to get touches (Buffalo, Houston). I think he is wise to wait; he'll make a lot more money "saving the day" for a team that loses a guy in camp and he's not likely to lose any of the aforementioned opportunities by waiting around a while.