Foles was a captain, wasn't he?
I think Keenum should be one: he seems to have the respect of others, and the confidence. He'd be a good choice.
I could see Benny Cunningham getting it. Tree and Tru, maybe. Donald possibly.
Don't know about Gurley. He might be too much of a star. He'll be a captain at some point, but guys might not want the sophomore sensation getting too ahead of himself. Who knows. It's all conjecture and armchair psychology, haha.