the oda isn't the clan that starts of as a vassal, that's the tokugawa.
i did a migration campaign with them once, wich has gone really well so far. i created a full stack, 4 ash to keep my only province safe, got a nice fleet and set sail. when i reached kyushu, i declared war on imagawa, landed on kyushu and conquered 2 starting provinces. right when i conquered the second, the oda came and broke any bonds with the mainland by capturing my home province. it's not all that hard, just make sure you leave a few units behind to guard, and have a fleet that can fight some enemies of, or your men will die.
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