How did the sun wind up in the middle of the solar system? Did the materials, gas and dust that eventually formed the planets come from the sun?

Question

I think this is the answer is it correct-

Since our solar system is already formed, we must try to reconstruct its history by studying current star formation in our local neighborhood, the Milky Way galaxy.

some one said that was the answer

The sun is in the "middle" because it has the most mass: Sun is so massive that as planets rotate around, the Sun does not move (much).