Am I the only one who thinks white diamond is actually the fusion between pink, blue and yellow diamond ? I mean ... JUST LOOK AT THEIR APPEARENCE ... it's just too similar to be just a coincidence

There's only one gem visible on White Diamond and since it would be rather difficult to fuse if two gems have their gem in the same spot (ex: Pearl and Peridot) I highly doubt both YD and Blie could be a part of that even if White was a fusion.