Hoping Williams comes back, but Hyde definitely seems to have the captain make-up. So does White.
On offense, I know he's had a muddled past, but is Incognito so far outside the realm of possibility? Alternatively, if Taylor ends up back with the Bills, even if not a starter, he seems like a good captain to me (cue the captain checkdown comments). Or, how about McCoy? Never thought I would suggest him as a captain, but he is a veteran and has really seemed to take on that kind of role recently.