Thought-form entities

[Aaron]

I think its important to note here that Ra says "for the development of life forms" and not "in the development"

I interpret that to mean that crystals can be uses to nurture or facilitate the development of a life form, not as a tool to actually develop the life form. Think of it like diapers are useful for the development of a baby, not in the development of a baby. A subtle difference, but it could mean a pretty different thing.