Excellent question, Mark.
There is no evidence for the Black Hole model and there is no evidence for the Black Eye model, simply because we are witnessing a force and a force is never visible.
We have the resulting outcome, but we either pick A: a single mass that scientific instruments cannot detect (Black Hole), or we pick B: all masses collectively causing the outcome (Black Eye).
Today, we have many, many physicists agreeing on one model, thinking there is just one model. That is the big surprise. Physicists discovered one model and they did not look for al possible models.
Everything we need to support the Black Eye model is already present. Nothing is missing. All data fits. We need not believe anything special.
With the Black Hole model, we have to believe something special. We have to believe that matter can collapse onto itself to the point it becomes invisible.
So, let's apply Occam's Razor. No surprise, we pick the model that explains it all in the simplest manner: the Black Eye model.
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Allow me to say here first that there are two models for the Eye of the Storm.
A: an invisible mass is located in the center of the Eye of the Storm and it controls the Wall of the Eye, the location that causes the most wind damage on our planet. Meanwhile, the Eye itself does not cause any damage because there is no wind, but that invisible mass is right there.
B: the collective of all that wind of the Storm is pulling on the center. There is no wind in the center, but there is an enormous depression. The Wall of the Eye is the first spot (away from the center) where friction is possible. The first spot with friction possible that is where we have the most extreme wind force on planet Earth.
With the Eye of the Storm, we all agree that model A is a stupid model. We know better; we have been inside the Eye of the Storm. Not so for the center of the Milky Way.
With a binary star system, we have three centers of gravity. One with each star, and one in the center in-between both stars. There is no invisible mass in the middle. This is also a fairly weak spot, gravitationally.
But add eight stars and all ten stars will circle one another. That barycenter in the middle will already show a tiny bit more strength, gravitationally. With 10 stars, we have (for sure) 11 gravitational centers, one of them without a mass, in the middle.
Add 100,000,000 stars and there will be a gravitational center in the middle. Lots and lots of pulling on that one center spot, gravitationally.
Based on the previous reviews of the binary star system and the 10-star system, we know that there is no (invisible) mass in the center.
We can laugh about physicists that went from no mass in-between stars to an invisible mass in-between (many) stars.
I do not need a Nobel Prize, but all physicists that said there was a Black Hole with an invisible mass should return their Nobel Prizes.
