I dont think players should be disadvantages skill wise just to be captain. Captains are usually one of the best players on the pitch
With the way the regos look like they will be now I dont see how you would fit it in without disadvantaging the player and IMO it would be pointless having someone who is basically playing as specialist captain.
I thought it could be one of the special abilities, but true, no one would want to be disadvantaged just to be skipper.