Wasn't the 1970s wen l'enfants terribles was going on? If so then that may have a role in the story, also the story will be wen big boss starts his army 'outer heaven' and also, i just want to mention something here, even if it doesnt mske sense,
Ok, in that image you see the four snakes, the obvious response would be that its multiplayer, but notice how the guy on the left is topless, that could show that he is Big boss or Naked snake. So is there a chance that they could be Big boss, Solid Snake, Liquid Snake and solidus? Just an idea.