so, Eusebius was every NT author & every NT compiler?
Eusebius I suggest was the Editor-In-Chief of the fabrication of the new testament canon. It is generally accepted that he had scribes and scriptoria available to him. What is not generally accepted is that he was sponsored by Constantine, and that he was a mercenary literacist.
how did he find time to write anything?
He was well paid by "The Boss" for his services.
You must understand that there are two different hemispheres in the entire corpus of new testament literature. There is the canon, and there are the many and varied "Other Books" generally classified as the new testament apocrypha. I am exploring the possibility that Eusebius was the editor-in-chief of the new testament canon, but that the new testament apocrypha were authored after Nicaea by Greek academic satirists, as a reaction to Constantine's support and publication of the canon.