Presuming they are banned and Amaury was going north (ie out of the Lurias) as we were trying to force him. He would still be able to be killed off (as some suggested) instead of effectively making him immune to anything until someone loyal to him is a Judge in one of the Luria's that will unban him etc.
Or put it this way:
Waiting until you know the numbers before you play the lottery, whereas everyone else has to take their chances.
