no
Yes.
Yes.
Yes.
Yes.
Absolutely, as soon as they begin there ULTIMATE END move ultimecia would be dead.
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.
Totally.
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.
not by himself.
Definetely.
Yes.
Yes.