Absolutely, as soon as they begin there ULTIMATE END move ultimecia would be dead.
Yes.
Yes.
Yes.
Yes.
no
Maxed out, KoTR does 9999*13 or 129987 damage, that is enough to kill ultimecia level 1, and over half of level 2 at the same time. Pair KoTR with wSummon and sure, its enough.
Definetely.
Yes.
He wouldn't even have to use KOR instead he can just omnislash her. Ultimecia is a joke when it comes to the final boss because she is so simple.
Yes it could but not in one hit.
Totally.
No because there are 13 Knights verses one Eden you can only guess what happens to Eden!