The first question has been asked, and partially answered elsewhere, but for the sake of clarity, and keeping all the information together, I'm going to slip it in again.

"Like a bullet rips through the skin of an apple, leaving most of the skin unscathed, The Old Moon crashed through the crust of PreEarth"

"The Old Moon, with a radius some ninety percent that of PreEarth"

The bullet/apple analogy works with a bullet and an apple, but in this theory the "bullet" is 90% of the size of the "apple", and they are composed of similar material. How can this be the same, physically?

There never was nothing.