Of the "star" fighters on that list Calzaghe is most likely to retire undefeated for the reasons that have already been pointed out

But I'd be surprised, and would bet against, Mayweather, Hatton, Cotto and Taylor remaining undefeated. They all still have years left and will be (hopefully) facing the cream of the crop in and around their divisions, plus all four of have already come close to losing.