Fujiwhara effect:

https://www.weather.gov/news/fujiwhara-effect#:~:text=When%20two%20hurricanes%20spinning%20in,its%20vortex%20to%20be%20absorbed.

The Black Holes are in reality Black Eyes. There is no mass in the center. The forces you describe belong to the collective. Matter in a galaxy establishes a gravitational monster in the center. There is no mass, just like there is no mass inside the Eye of the Hurricane that controls the Storm.

My article 'The Scientific Black Eye':

https://fred-rick.medium.com/the-scientific-black-eye-b631eb1817f0