If there is an undeserved rematch then It comes down to Chisoras conditioning. If he comes in in tip top shape I think he stops Fury. But I dont think he ever will come in in that kind of shape.
If Chisora cant be arsed getting in shape I dont want him to win and would like to see Fury spark himout next time. If he does get in shape the fight is alot closer but I reckon Fury is improving and would still win UD.