Not Spaceghost
Spaceghost
snake_eater_raiden does not realize that The Witcher 2 was already semi open world while MGSV is nothing like the other MGS games and they had to start from the ground up with everything.
But like 80% of MGSV's design framework is built from peace walker.
Peace Walker even had a pseudo open world type thing going for it too, where multiple missions took place on the same maps just had different objectives and enemies.
The only new single player elements MGSV introduces are honestly the buddy system and of course the full open world.