So, perhaps one could say that so far, the impact theory causing the Moon is one of the best theories.

And this because capturing a moon is unlikely, and the earth and the Moon share similar *surface* compositions.

The Moon impact theory can be seen as merely a "way" making capture as more likely- but still require a small window.

What we know is that the Earth was hit by many large impactors. What we know is that large impactor can eject a large amount material in orbit or escape.
So, why couldn't the Moon be formed by multiple large impacts.
And instead of moons being something that requires capture of some kind, Moons are merely a result of planetary formation. And what rare about moons, is not having each of them them toss each other out of a planetary orbit or impacting the planet itself