He'll get baited into some interceptions during the regular season but he's also going to make some insane plays. Looks like he's barely trying on his scrambles, and the deep ball looks great if his receivers can get separation
CB room is so thin, I don't see them dumping our only big nickel/relying on Jammie in year 1. Plus Chinn was up near the LOS basically playing LB last week as well
You can also call up 2 practice squad players a week at any other position, the emergency QB has to be on the 53. Some teams will probably gamble with some backup/special teams guys on the practice squad in order to keep the 3 qbs on the 53