wishbone I'm assuming this is something Mitch sought out on his own. Nothing anywhere about him on the 'net with other teams. He must have wanted it for the coaching/training, etc. as he will most likely never play a down. Also, it is a much better way to get a Super Bowl ring, than it would be in Chicago.
I think there was something fishy going down with him and Nagy. Technically, one of the best QBs the Bears ever had, on paper, yet got benched, & when put back in he was still stifled by play calls, and no offer tendered. It smells bad.