Due to cuts. I remember the fight, you could make a strong case for Klitschko in it.
Vitali demanded a rematch and still does to this day
De La Hoya doesn't have the same case as the big Ukraine had, but the situation is similar. Lewis had a bigger case to retire than Floyd though, since he beat the only real challenger in the division (but cuts though) and was pushing 40. Lewis' legacy >>>>>>>>> Floyd's