That's because we understand the physics of compressible fluids like air, and we also have actually been in hurricanes and not found any detectable masses there.

But you could postulate a Model A where there was a Storm King with the highest winds in the eye, and then come up with excuses for why nobody's actually found the winds. ("They're too high", "the wind goes every which way it can and this confuses doppler radar", etc.)

So, with regards to Model B, I have some questions.

(1) What determines where the center is relative to the rest of the galaxy (or relative to whatever matters)?

(2) Is the center the result of "ordinary" gravitation, or are you postulating an entirely different type of relationship between mass and gravity that doesn't remotely obey the physics we know?

(3) Does Model B make any predictions about what causes the size or intensity of the black eye? Does it have anything to do with the size of the galaxy or the structure of the galactic core or...what?

(4) Does Model B include the possibility that the entire rest of the galaxy is irrelevant and it's just caused by the mass that everyone thinks is there, but instead of being in on the other side of an event horizon, all the mass supposedly in the eye is in a ring or something right around the eye?