It seems a tad simpleminded to me that the GMG would be foolish enough to fly one of the weakest gunboats in the game for a flagship of a mini-house in its own right.
That wasn't meant to be rude, but not only is the IMG GB a lightly defended ship, the Explorer is a terrible combatant vessel. I know, I fly one.
I'd outfit a handful of "Expansionary and Research" capable Explorers for use. Lightly armed, due to their non-combatant purpose.
And I still think a single Albatross is a good idea. If you don't: please explain why.