I'd be good with anyone of these guys, in order.
Nassib
Manuel
Barkley
I use to have Manuel first, but I was so impressed with Nassib on Gruden's QB Camp, I moved him to fist. Nassib is the biggest risk for Marrone. If Nassib fails Marrone should have known better.
I'm intrigued by Manuel. Isn't the guy with the greatest upside what you want?
If Barkley had come out a year ago most people would have been screaming for him.