There's something you've forgotten,
Phantom, dear, or at least something missing from your mathulations. In the event of
Shasta's death, the role of the next gifted on the list is revealed to a random ordo. Thus, if
Shasta dies, Isildur (or, if we're super lucky, Elendil, though I hold no hope for that) will be revealed to one of the innocents. So our future situation is in truth better than you describe it. Well, not for
Shasta, I suppose....