He is an absolute abomination. But, Oda and his handlers are geniuses. They've sold all the merch possible, milked every drop of Gear 5 white form. Thus time for Gear 5 black form.
Oda learned well from DBZ. Or actually this is after Toriyama through DBZ Super but it still holds true. Black hair, golden hair, red hair, blue hair, white hair. New merch, new income.