read that Gailey recruited him. (disclaimer- wikipedia)
apparently has potential for QB (maybe), RB, WR & S
possible add him occasionally as an option QB. 1/2 the reason it doesnt happen in nfl is the risk to a highly-paid player, which he will not be.
The other half of the reason it's not used is the Def's are fast enough to stop the option, so who knows.
With the new cba rules allowing coach to inject #3 QB, and put #1 back in after, could possibly allow this sort of thing.