I agree there, but I have my doubts on believing that McKelvin is going to be as effective as a return man as Hester is or Parrish/McGee even. Just a hunch, but seeing as Hester can play both sides of the ball and has hands (we know McKelvin doesn't have hands and chances are that would make him ineffective on offense) I can't see him (McKelvin) being quite as good at returning as Hester. Its wishful thinking and he might be a damn good returner, but I wouldn't personally want to see it all that often, more or so every now and then, but not on a weekly basis. If he is the most effective playing CB let him stick to it for a while and let our proven returns do what they do best.
It also doesn't take a sharp person to realize they are going to get "JACKED UP" if they dont signal the fair catch, which I think he might just be smart enough to do. I think our brass doesn't want him returning right out of the gates to prevent injury and turnovers.