why do you suppose that is
actually not supposing anything here, i tried to imagine yamato as a nakama and came up with this conclusion, daimyo or not, yamato, is more an ally than nakama, and, will show up in the final war(s), (if Oda wants to make it happen of course). By the way, the word nakama is a bit deprecated, in the context of grand fleet. as long as yamato (or any SH friend) is ready to help for the upcoming war, it is fine to not having him permanently on the sunny. (ended up with nakama as synonym of ally here...) , that is why i picked "no" in the poll