Who knows?
That’s what they’re trying to figure out.
I’d say your guess is pretty good, knowing what little we know.
Image the heat, radiation, gravity and just plain density of the stars in the galactic center. It must be enormous!
I would think it could be a place where weird things happen...
If the orbiting black hole(s) are DIRECTLY in your line of sight, they would produce a brightening, then a dimming, then a brightening again. And would do so in the period of revolution about the center of the galaxy’s Big Black Hole.
Slightly off-center, might produce the brightening only.
From this, the period and the mass could be determined for both the orbiting black hole and the Big Black Hole...............