Firstly, thank the Governor for his cooperation and accept the generous offer of lodgings. But don't lay it on too thick. He knows we could have just forced his hand in any case; he's playing smart by accommodating us before we get around to that.
The worrying thing here is that the Governor just said that the IG is preparing to deploy on those Hive Worlds to start putting down the revolts. If we take too many troops, they won't be able to do their job properly; Hive Worlds are a BITCH to properly clean out, even for Cadians who are experts in urban combat. It's strange that this guy didn't tell us when the Hive Worlds rebelled, or the Orks set down on those worlds right proper. If it's been a few months already, they could be so well-entrenched that it'd take everything we have to dislodge them. You do not want Orks to put down too many roots.
Ask the Governor how long all these problems have been going on already, and what's been done about them so far. Also inquire about the Bronze Specters Chapter and what he knows about them, or who could tell us about them.
In any case, let's send an info-ping back to our patrons at the Inquisition to request any information they have on the Bronze Specters, including their derivative founding chapter(s), last known Chapter Master, interactive and tactical doctrine, known capabilities and responsibilities, homeworld, etc. They are definitely going to know something about this.