There are white Sumatra out there, but very few and far between. They tend to be way off type and with bright red faces because of the Phoenix and Yokohama that were used to make them. Personally I would not use a white Phoenix because you will for several generations be fighting the white earlobes. You will also get floppy combs because of the large single combs on the Phoenix. I recommend a white Cubalaya cock with a profusely feathered tail. I believe there is a lady in one of the far southern states that has a Cubalaya cock that looks a lot like a Sumatra, but is white. I don't know if she would be willing to part with him. Perhaps you could post on facebook asking for information concerning them.