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In their transformation, when their physical bodies had a time limit they were not degradable and so they could connect and restructure themselves as if connecting and recreating their body through host bodies the old bodies did not deteriorate.
So they immediately discovered what would happen, that's when they crystallized and returned to a form of navy blue crystals their essences alone chose a new host being able to share with another sentient and conscious being and another alter a technological hybrid form, causing and inducing an evolution.
Even with that, it was causing a merger of consciousnesses and the more using the host body, the more the former one losing consciousness and being absorbed by them and thus becoming a complete being.