Thought I was going to get more info on Liquid Snake and Solid Snake and others in those two videos. They did a decent job but feel like they left some good parts out. I figure since this may not have any valuable DLC, I will have a month to beat it and trade it in before Rainbow Six: Siege drops.
If anything, MGS V is going to give you the origin information you're looking for in terms of Solid and Liquid. V is completely centered around Big Boss.