His sibling looks like a Super! They are average looking Supers! You will never really know until you breed it! If it is a Super then you will not get any normals, everything will at least be Supers!
Yes, he says he gurantees the genetics but he got them from a breeder who was getting out of Balls, so he may just be "sold" on the idea that they're for certain Supers. I can't say I'm sold on that though. We're working out a trade but I just want to be sure first...Don't know what to do, haha.
Unfortunately people getting out of Balls tend to say whatever is necessary to sell them. I learned this the hard way from a deal with Tom Crutchfield.
However this is not always the case, but still I would trust your feelings and research over what the breeder says, if you are not 100% sure that it's a Super you may want to pass.
Being in a area so close to so many great reptile expos you definitely would not have a hard time finding another Lesser Super Pastel.
"We are artists using locus and alleles as our paint; the ball python as our canvas" - Colin Weaver