I think it would be unwise for him to claim an inhabited sphere for his alliance and his alliance alone. Then again, if he should wish us all to leave, I'm sure we wouldn't mind making his trade situation all that more difficult. Hell, it'd be easier on us brown alliances.
I should also say that while I've been playing long enough to know who Moldavi is, I never knew him. That being the case, I'm also one of the people that won't believe the things they read about him. I'm sure he's probably no more than half as bloodthirsty as some would have me believe. Though time will tell.