as far as it goes, no, technically it doesn't matter a whit who is captain. However, since traditionally the England team has been followed by legions of young, impressionable kids who follow the side's every move, and since allegedly the England players are supposed to be role models, then one would HOPE that the captain would be chosen NOT ONLY on the merits of his playing skill, but also for his qualities as a leader and role model for youngsters. One would HOPE that this person would at least attempt to exemplify a semblance of civil behaviour on AND off the field as he would be a sports ambassador for ENGLAND. One would hope that the person chosen wouldn't frequent prostitutes, sleep with teammates wives/girlfriends, not bash people in the face while drunk at a nightclub, not stub burning cigarettes out in peoples faces, not spit at fans and generally behave like a human being, not a thug. wishful thinking I'm sure and a ludicrous concept in this modern age but one can only hope.
By the way, before anyone jumps, I am using the above examples as examples of things "Bad" footballers do, not implying that JTerry has done any or all of those things himself.