I love the way DH works in the starting phases. I think the system allow for truly interesting scenarios. A bunch of no-name run of the mill guys, getting picked for work in an Inquisitorial acolyte-cell because they have shown SOMETHING that just happened to catch the eye of an Inquisitor.
I don't believe that inquisitors make acolyte-cells for no purpose. They are so expendable in the early stages that the way I see it they are put together to serve one purpose. If the Inquisitor wants some info on a local cult, but can't spare any of his retinue or doesn't wanna risk exposure, he assembles a group of acolytes and give them a mission. If it works it works, if not, who cares?
Purest coincidence placed you in a very precarious situation and now you've got to live with it.
Then of course there's also the possibility that the Inquisitor in question prefers to set up potential acolyte networks in advance. I can easily imagine some scummer being raised by his parents (serfs in service of the inquisition) so that he will be prime material for the inquisitorial meat-grinder when he reaches military-age.
In DH the opportunities are endless -because- you start out being a nobody. At least IMO.
You could have an acolyte-cell that doesn't know it is working for the inquisition. They only get to know that later on
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That is of course unless you have a sororitas or psyker on the team XD. The fighting arm of the Ecclesiarchy are not put into groups with a death-cultist and a ganger, and be expected to find a drug-runner gang in some greasy underhive. And neither are the Imperium's firestarting, warpdabbling maniacs.