If that was my starting group, I would take the tufted white roo over the rumpless white hens and build up my tufted stock and work on tufted rumpless. Then take resulting tufted pullets back to the black rumpless roo to get black with tufts as well. Any tufts on my whites originated from some of my original black hens over a white rooster. I then kept breeding only whites moving forward, but I know they are black underneath (which wouldn't be visible until you take them back to black).
Jody

Jody