Yep, it says he was the son of The Boss, not Big Boss - I think you just misread that part. Good point on EVA's Tape though. The message of Big Boss' suffering at the end of the game though was the point to get across for the setup of The Phantom Pain, so as long as it's covered, not too worried about it.
Completely agreed. It's great to see games that exist for a story and not a franchise.
We don't use that word here! It scares gamers off...