Platinum is Lesser X Daddy Gene. The Daddy gene is found in the Lesser and normal sibs produced by a Platinum X Normal pairing. Pairing a Lesser with Platinum in its lineage to a normal sibling with Platinum in its lineage may give you Platinum. Breeding a Platinum to a Lesser carrying the Daddy gene may also give you platinums, lessers, BELs, and normal carriers...it's complicated. :)
All Lessers derive from the original Platinum "Platty Daddy", to the best of my knowledge.
That having been said, that is one seriously smokin' Lesser.