The Inquisitors retinue will only have 3 Veterans/combat
servitors, but in the rules of the Daemonhunters/Witch Hunters
codex it allows you to take 1 HQ 2 Troops (it might be 3, I don't
have the codex with me) 1 Elite and MAYBE 1 Fast attack. I know you
can't have Heavy Support if you using the Inquisition to ally with
Marines, but if you use Conscripted Marines to support an
Inquisitorial army you can have your normal limits (2 HQ, 6 Troops,
3 Elites, 3 Fast Attack, 3 Heavy support)
Although it says Grey Knights won't fight with conscripted
Marines, if you use them to ally with a marines army you can. It's
accounting for a Marines army finding a terrible warp rift that the
Ordo Malleus hasn't seen yet and they dispatched a small number of
Grey Knights to help fight the swarm until the Inquisition can
purge them (either through purification or the Exterminatus)
If that wasn't clear enough contact me & I will try to
explain a little better.
