Well, then explain the drop in Subtlety. What exactly is the difference between a 75+ Influence Acolyte and a 75+ Influence Inquisitor that only help from the latter would risk the warband's activities being uncovered?
At the start of the game, Shepard is someone who matters only for other humans , and even there only some and not all.
But it's not true. You see, other races shouldn't love him or even like him. But when you're speaking with somebody who attended with Council Space politics Shepard IS somebody who matters. Shadow Broker isn't human; Barla Von isn't human; but they have dossier on Shepard and leak intelligence for him. Not to anybody else. Sha'ira is not human and she knows about Shepard. Her lover is not human and he knows about Shepard (and Shepard can even push him!)...
He is somebody worth keeping tabs on him. Even if he, being provincial military officer, can be surprised with it.
Or another good example about what Influence (not high at that moment) is:
"Norrington: You are, without doubt, the worst pirate I've ever heard of.
Jack Sparrow: But you have heard of me. "
And really, as we know, Jack Sparrow have pretty good influence at that point. He IS one of the capitans, after all, and he is the son of the Keeper.
Or, I don't know, Doctor Who shows good example of astonishing influence. He was so weary about it that Eleventh even wipe any trace of his existence to drop Influence - and it's not helped.
That would explain the drop in Subtlety, but it postulates that all Inquisitors are semi-public figures who are not operating from secrecy, which is a pretty drastic contrast to the work of the Acolyte warband.
Well, I'm not sure "semi-public" is the right world, but, of course, any Inquisitor is official figure. That's why he need acolytes to do dark work!
By the way, if we looks into Inquisitorial authority it's somebody near our-world totalitarian state intelligence service head. Every damned one. In Imperial matters it's counted for sector I believe (well, there are Imperial-wide Inquisitors, but THIS is rare, Imperium is too big for that!). But in the sector if you're matters you WILL know, or at least try to know, Inquisitors. At least every one who flashes his Rosette and leaves anybody to speak the tale.