Hi Mike,
Yes, Sanke spawns contain everything,... except Sankes.
By this I mean they are mostly throwbacks and every color under the rainbow - including the greenish sumi you mention, that sumi though is more like the old style Showa sumi, and sits on the Koi's body in the same fashion. There are very few true Sankes in a group of 200,000 fry.
Best Wishes,
Brady Brandwood
