Why tf is Jeanne Alter there? Also did the master say he was Miyamoto Iori? Sounded like he was calling Musashi "shisho" so that would check out.
I honestly wonder why Jeanne Alter is there too as I put in an edit for that
(TL;DR FGO has always been weird on whether she's a True Servant now or just exclusive to the Chaldeas System and will fade when Novum Chaldea disbands, so I guess the former IS true after all)
I didn't have the sound on but that could be the case considering he's fighting Servants like Musashi did in Shimousa so there's that.