Pretty sure there was talk of Reticulated disapointment when you asked about them in the 1st place. They're just like Scombs. No one knows why, it's just easier to accept it and move along.....
I'd stay away from Marbles after this ordeal, I've had several Marbles pull the same crap Retics do, and considering what you've allready been through IF you go shell out $300-400 on a Marble and it checks out you're gonna hate rays forever.
What you need is an established male Motoro. Hit up MNstingray, he had a hybrid Marble/Motoro that's been in captivity a while and is a proven breeder.