I'm always confused when people use the word 'hybrid' to specify some type of genestealer cult models. Aren't all hybrids? I know about Neophytes (used to be gangers), Acolytes (used to be champions) and Aberrants.
It's also because not every member of the cult is a 'hybrid', which originates in differentiating the hybrids from the general cult pop who aren't hybrids - the 'Brood Brothers' who are sadly missing from the current list....“Hybrid” means (used to mean) anything between infected human and pure strain genestealer - so anything from first through fourth generation of reproduction on that route.
Human gets implanted. Human. Has strange kid. First generation hybrid. That kid has a strange kid. Second generation hybrid. That kid has a less strange kid. Third generation hybrid. That kid has a human looking kid. Fourth generation hybrid. That kid has a pure strain genestealer kid. That kid implants a new human. That human has a first generation kid.
Which gives a sense of the time scales involved.
Also, found this in my bits bin for Space Hulk:
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