I don't know if I'm spot on with this, it's my personal opinion.

There are alot more "odd balls" produced than than the platty daddy/lesser gene that are suspected to have a hidden gene. I can't be arsed to go get my bible (The Complete Ball Python) and look them all up but they are there.

As I see it you can view hidden genes in two ways.

1. The hidden gene is dormant until "unlocked". As the knowledge about these genes are still very much a mystery no one really knows how to unlock them, it just happens. And when you finally hit that odd ball that you just know is genetic there is still the mystery regarding how to prove it genetic. Alot of breeding is needed to find out I guess.

2. (this is mainly for platty/lessers) The platty gene seems to be co-dom/dom with a touch of simple recessiveness for the hidden gene. I don't know if there are other morphs out there with this genetically composition but that's the easiest way I would describe the platty.

I don't know if this helped you at all, a bit tired, hope it stretched out some of the question marks though.