I think it may end up being that despite everything else, Ishamaels claims that this is a battle between the DO and Creator using human surrogates will turn out to be true afterall. I think Rand will merely repair the bore somehow and lock the DO up perfectly, atleast until the next time the wheel turns. However before that, he will have to face and defeat his opposite, the DO's avatar/champion in the world which will likely be either Moridin or Shaidar Haran.