WOBP is an awesome picture hub and in a lot of cases a terrible information hub. Kevin is an awesome snake breeder, easily one of the best, but when it comes to science type of info, again a terrible hub.
Kevin put a video out years ago that had an explanation of the granite attaching to the hgw and his lessers having some hidden gene also and all sorts of stuff that have been proven not to be the case. This has caused confusion for years.
but as stated above, soul sucker is just as hgw and a lesser, the granite part is just a variation of the hgw. So if you see a animal listed as hgw granite, just think of it as one morph. There are granite genes out there some with cool super forms, but the granite gene always "attached" to the hgw is not one.