A Genestealer Cult on a world that repelled Tyranids?

[Zephaniah Adriyen]

I had an idea a bit ago - what would happen if a Genestealer Cult existed on a post-Tyranid invasion world and came across, say, a brood of Hormagaunts deep in an underhive? Maybe they could train the Gaunts as attack dogs of sorts, by multi-generational (and highly dangerous) breeding for domestication?

[Stercus]

It’s an interesting idea, although I rather suspect that ‘gaunts and other warrior beasts are most likely sterile. The hive mind would be unlikely to invest in providing energy-expensive and complicated reproductive systems in a creature that is basically a soldier ant. Certainly ants, termites, bees and most social wasps have specific castes that breed the next generations and it seems likely that Tyranids would operate a similar system. 
It might be better to go down the route of the cult nurturing leftover mycetic spores and “waking” the tyranid beasts as required.

[Dreagher]

At least Hormagaunts are said to be able to reproduce on their own, at a rapide rate.

[Zephaniah Adriyen]

At least Hormagaunts are said to be able to reproduce on their own, at a rapide rate.

This, this was the lore snippet I was basing this off of. Hormagaunts can reproduce on their own, uniquely for Tyranid lifeforms. They are not, in fact, sterile, for once.

[Azekai]

Broodlords/Patriarchs are very psychically powerful; is there a reason a sufficiently powerful genestealer psyker could not be the thing that reigns in the otherwise feral hormagaunts?