Thread:ChongShyuan/@comment-4802891-20170930133259/@comment-27971189-20171019174330

At some point, Kojiro met OG Musashi (old man), and learned about AU Musashi who spark his interest; at the end, he simply return to OG Musashi and said that AU Musashi gave him a good match and mastered "Void" that OG Musashi now can rest in peace.

The one created Shimosa is parallel-world Amakusa and Ashiya Doman.

It will take time until young OG Musashi to be summonable as Shimosa ending said that Musashi recorded by Chaldea is AU Musashi, not OG Musashi. Most likely they will pull kind of reason like Muramasa, unknown top-class summoner summoning him to make things right in world full of chaos.