I was going to say, in reply to the Gap Theory video, that I couldn't find anything about the Gap Theory in the older Scofield Bible we have here, but that perhaps it was added in some later edition.
However, I dug a little further, and I found that Scofield did mention something along that line: in the note for Genesis 1:2 where the earth is without form and void, he says that it was so because of a divine judgment on the fallen angels. But he says it obliquely:
"Jer. 4. 23-26, Isa. 24. 1 and 45 . 18, clearly indicate that the earth had undergone a cataclysmic change as the result of a divine judgment. The face of the earth bears everywhere the marks of such a catastrophe. There are not wanting intimations which connect it with a previous testing and fall of angels. See Ezk. 28. 12-15 and Isa. 14. 9-14, which certainly go beyond the kings of Tyre and Babylon."
I looked up all of those verses, and in my opinion Scofield went too far out on a limb with this.