Went in to talk to them and see about the parents and learned only that they have a severe misunderstanding of what co-dom and recessive are. Unfortunately I know more than they do and can't confirm that he's even het for g stripe. Looking at his pattern after some research he's straight lesser visual. The answer at the pet store was, "sometimes genetic stripe shows up, sometimes it doesn't but if you breed it you will definitely get some true genetic stripe babies.".

Clearly not true. Given that I couldn't get any info on the parents I suppose there's a 1 in 100 chance he's got it. So while he's a pretty lesser, I'm not a gambler. No lesser het g stripe for me.

Thanks for the advice!