That part is interesting. I could see Martinez red-shirting... but who knows at this point? Seems like a good problem to have. A QB can have a big impact on the success of a coach. I would take as many as I can get.
Over his career he had 15 passing touchdowns, 12 interceptions, and 20 rushing touchdowns (https://www.foxsports.com/college-football/brandon-dawkins-2-player-stats). I've never seen him play, but based on the stats, and the fact he lost the starting job at Arizona, maybe he's an insurance policy in case none of the young guys make enough progress? I mean, his decision making in the passing game seems a bit suspect. But what do I know.