Speculation: English Localization Issues?

[MGWSpike]

If it came from some "story bible" that would make sense, but I'd be surprised if such a thing were made available to localization teams.

Jeremy Blaustein was a Konami employee, not an external contractor, which probably explains why he had access to this.

He posted a sample of said documents on Twitter. Japanese Metal Gear fan HEITAIs noticed the info about Big Boss's heritage.