The idea that breeders will just accidentally sell a visual morph to Petco as a normal is a stretch to say the least. There are lots of light colored normals with blushing out there. Neither the light color or the blushing makes them a pastel.
As far as your idea of buying this light colored normal from Petco just to try to turn around and sell it as a Pastel (when its not)... I would NOT recommend it. It would be a pretty difficult task not to mention the permanent damage you will do to your reputation when the buyer figures out they got ripped off.
And to the guy who believes a Petco employee found a Pied ball in a Petco batch, I have this fantastic ocean front property in Missouri that I would love to discuss with you via PM....![]()