I had my speculation just because i think they're going for a Golden Ending, where Jack gets back to the past and goes on to become Emperor and a father to a son of his own, and the question is where he gets a wife in that scenario (and it would be silly to go the "random village girl" route, like in Fire Emblem Awakening if you somehow manage to not romance anybody).
Of course, the problem with Ashi is that if Jack does successfully correct the past, it depends on the rules of time travel in this universe and whether Jack "unmakes" her, and everyone else he's met, due to averting the future of Aku.