Still about the Chosokabe clan:

Maybe Black Ship just generalized slightly, but Chosokabe Motochika wasn't just a Hideyoshi general. He was the daimyô of Tosa, and he and his predecessor controlled, at the peak of their power, pretty much the whole of the island of Shikoku (known to us as the Ronin Island). Knowing STW's way of bending history a bit, it's plausible to assume that the Chosokabe clan would have controlled the whole of Shikoku, and maybe Awaji as well. The problem is, they would still have had only five provinces, whereas all (?) the others have six. According to Turnbull, Hideyoshi invaded the Island in 1585, and after some battles the Chosokabe capitulated rather than stood against the Oda Horde. They were allowed to keep Tosa, and later, as Black Ship pointed out, assisted Hideyoshi in the Kyûshû and Korean expeditions. Finally, they fought with Ishida against Tokugawa at Sekigahara, and Tokugawa later confiscated the last of their lands.

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"The ancient rule declares that letters are the left hand and militarism the right. Neither must be neglected."
- Hôjô Sôun