So, I already have things to say about Completionist's video.
He mentions the alien Cetra and the native humans. I thought humans were Cetra that forsook their migratory tasks and settled, though the only source of this is Sephiroth in his fall into insanity. Is the youtuber implying that humans were already there before Cetra cultivated life on the Planet (which is unlikely)? Is he stating that the Cetra had moved on and returned much later to a point where the humans could already be considered true natives of the planet? Either way, which are his sources for this?
He also says that Jenova was found on Mt Nibel: wasn't it discovered in the North Crater?
"Back to a conquered Wutai, Yuffie is born." Isn't she born before the war?
Also, the non-FF references feel really out of place.