Clear Ventral Scales A Diffuse Indicator?

Well, I went through several years worth of hatchling photos for diffuse ventrals, and even got a few progressions and have come to the conclusion that yes, some diffuses snakes have clear patches on their ventrals, but not all of them. Lineage also doesn't seem to be a factor as it varies within the same clutch. When the clear patches are present, they do seem to be apparent fairly young. Of course, to continue the "research", I will have to go through all the motleys and stripes I've hatched out over the years to see if there are any clear patches on their ventrals or not.

Here are some examples of diffuse ventrals and it will take several posts to get them all up:

First photo - female diffuse post first shed (Aug '08)
Second photo - same female (Jan '09)
Third photo - female diffuse post first shed (Aug '08) - full sister to above
Fourth photo - same female (Jan '09)
Fifth photo - again, same female (Feb '10)