User blog comment:MaatRa91/Isshin a substitute shinigami?!/@comment-452405-20100624121603

Nah I'm pretty sure the white cloth is just his haori tied to his shoulder, same thing the rest of the captains wear it's just he doesn't let it flare out like 'em. As far as we know he's a full-blooded shinigami, no question about that, I don't think there is anyway.