These boas are not anerythristic (neither are the Caulker Cay boas) though many of them do have reduced pigmentation. They also go through extreme changes in overall tone and contrast depending upon temperatures, time of day or who knows what.
According to at least one observer the Crawl Cay boas are represented by only a handful of animals on their native island. The number of real Crawl Cay births in culture is very small. In my opinion it would be a crime to pimp out these unique boas onto some morph-of-the-hour project.
I like the looks of some of the morphs and I have friends who work with the morphs. These people know the limits of what is responsible and reasonable. Outbreeding rare and unique insular boas just to see what you may get is not reasonable or responsible.. In my opinion.
Have fun, be safe.

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Gus
A. Rentfro
RioBravoReptiles.com
www.riobravoreptiles.com
"Quality is not an accident. Perfectly healthy animals are a minimum requirement.. everything else is just salesmanship" gus