Ah yeah, that's a reasonable point. But in the latter campaign with Oda Nobunaga, Tokugawa Ieysasu certainly would be around.

Yeah, the Chosokabe would be cool to have in it. And the Otomo, Ryuzoji, Hosokawa, Asai, and Asakura would also be great. I would very much be pleased if they let me play as the Asai!

From what I've heard so far the playable clans will be quite limited. : / Maybe other clans will appear as unplayable? (Perhaps this can be fixed with editing or modding.) It's just speculation either way right now.