Is Reina not doing a decent job ? He's one of the most senior players we have , very charismatic with good leadership skills . I wouldn't be in any hurry to change from him really.
Some will use the "the captain should be an outfield player" argument but that's shite , it makes no real difference at all especially if there are other leaders on the pitch . It might make a difference if the captain role
was like in rugby where the ref talks and listens to the captain but it isn't sadly .
Guess that answers question 3 also , the role isn't really that important in football as the captain has no real influence or voice during the game . If you've a few decent leaders on the pitch , some senior players motivating the younger , keeping heads up then a single captain isn't really needed .