Thread:Bluerock/@comment-1672596-20191220205419

Okay, here's the exact text from that Google Doc that relates to Psycho Mantis:

As the above logo sequence occurs, we hear the fall of the aircraft carrying Mantis, caused by the real Snake (Ishmael in this part of the game) waking up.

Inside the plane, a young Mantis is returning home with his father having received some kind of treatment. The no-longer-comatose Big Boss' thirst for revenge awakens the boy's power as the plane passes overhead. The boy bursts into flame in his seat, and his parents, sitting on both sides of him, catch fire. One by one, the other passengers are engulfed by the flames. The cabin is consumed by this mysterious inferno, and the plane crashes near Cyprus. The boy is the sole survivor of the crash. Given the damage to the aircraft and the contents of its black box, he becomes the subject of intense scrutiny. After he is taken back to the Soviet Union, the KGB sends him to a special research facility where Volgin is present. It is there that the two meet.

This occurs on G507-G515. The script is essentially the Metal Gear Solid V equivalent of the Document of Metal Gear Solid 2 scripts, and we previously detailed stuff in the main articles stuff from that source that's never directly indicated in the game. So yes, that does count as a retcon ultimately. 