I'll be looking for a spotnose pair in '13 to grow up and try for Powerballs, so when I eventually have babies I'll take note to look at the normal sib's bellies to see if they look like the two males you posted pics of.
I'd love to see the Spotties you produced though
Edit:
I think there was some confusion: the male the OP posted isn't a Spotnose, he's asking if any normal clutch mates have busy bellies too or if his are fluke babies with busy bellies.