I think in one of Corey Loses' video's he says that Grevious will 'upgrade' his flagship in Galactic Conquest. So I think he goes from a regular Providence to Invisible Hand to Subjugator.
If he dies in space combat in Glactic Conquest, he downgrades by ship until he 'dies' for a duration, or he's dead for real (can't remember which one).
As for Skirmish, I imagine he'll just be in the Invisible Hand.
I hope that helps.
Jafod
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