Astronomers tell us the stars in our galaxy are in lock step. They turn
like the spokes in a wheel. That is true of stars inside the hub.
Because of the great gravity of that huge BH they have to revolve around
the blackhole so very fast that the gravitation that keeps our sun in
lock step with the rest of the galaxy has no effect on stars making up
the hub. Not in the books but that is the way I see it. Bert