u would have a 25% of creating a SBP or BEL Super Lesser. the chances pure Super's of each are 6%, otherwise the Super's would have another gene.

yes, u can make a double Super. i would imagine that the leucism would overpower the SPB genes and u would have an all white snake. an 8-Ball Lesser is already a very light snake with hints of silver. i think it would be really difficult to tell w/o proving/breeding out all the genes that would be at play in an all-white Super.