There are people like the idea of Non marrying the Lady Uncle. I personally don't think it would happen. I'm not really against age gap or anything, as long as the people involved in the relationship are aware of the situation and accept it out of their own deliberation and decision. I simply think that it is not in character for Noh. He himself is not against the idea of remarrying, not for the sake of his children, but for himself. He wants a companion in life. The Lady Uncle might be smart and pretty and in this kind of troupe (martial art society) is traditionally the perfect choice, but Noh's wife had fulfilled this stereotypical role well enough. I don't think Noh would care for another repeated experience. He's not dumb, when the lady makes pass at him (else he would not have gone on the date) (and I doubt he is unaware of the true gender of his "comrade" - Noh could just feint ignorant to avoid awkward or further complicating the situation) - after, Noh had clearly stated he's not interested. So that's that.