Ok, weird question..... Not sure exactly if I'm thinking of this correctly, but here goes:
If I had an Inquisitor and Retinue (which, as a group, counts as a "unit"), could I join a Primaris Psycher to the unit (since he can join units)? If so, and I have an Astropath in the retinue, could said Primaris use his Lightning Arc (shooting attack) when a unit attempts to deep strike in for the other army (for the free shot on said unit that Astropaths entail)? I'm not sure if I'm making any sense, and I'm not sure if I remember the Inquisitor Retinue unit status reading, since the codex is at home.... Any thoughts on this?