i've heard this too, but it's always been hearsay on the forums. i've also heard people say they've asked brian about this and he's denied it. do you have any links of it coming straight from the horses mouth?
i highly doubt that if super pinstripes were possible there would only be one in the world. you say not enough research has been done because people don't want to raise the babies all the way to adulthood and breed them to find out. whether they raise them theirselves or sell them, that doesnt change the fact that they could still be supers, and there would've been at least one other person come forward and notice they had a pinstripe that was throwing nothing but pins. but even if brian does has a super pin, why doesn't a single other person out of the thousands of breeders? it could be a "fluke" of sorts. there have been "lethal" combos that have survived.