Blackshoulder males will start out with the mostly-white pattern found in Blackshoulder females, then molt into the adult colors as they mature. So young male Blackshoulder peacocks may still carry some of their juvenile white feathers. If you know your male is mature, then you can wonder about those white feathers possibly indicating having the White or Pied mutations. From what I remember, the tough part is determining if your bird is split to Pied or split to White, since these can be rather similar -- just a tiny bit of white. From what I remember, being split to Pied will present those tiny bits of white rather symmetrically -- tiny white on the throat, and a white feather or two on each wing. The White mutation is more random, so any white feathers would not present symmetrically, and could be found anywhere. If the throat patch is more like a bib, and there are several white feathers on each wing, then your bird may be Dark Pied -- which means having two copies of the Pied mutation. But I'm really not that fond of the Pied, White, and White-Eyed mutations, so I don't really focus in on the differences as much.