And the nuclear disarmament has Big Boss monologuing about how he needs to drive out the demon inside of him.
So really, nothing about it suggests it's a "non-canon" ending. Ocelot even says that "upholding a nuke free world" would be harder than reaching disarmament.
My suggestion earlier
SPOILER: Metal Gear Solid V Spoiler Thread | Three has come to
I maintain my theory that Venom's hypnotism forced him to side with BB.
Continuation of my post from the previous page:
I believe, considering his uncharacteristic traits, that he isn't really a mental replica of Big Boss, just a guy with a huge amount of hypnotic suggestion and reports on BB, who believes he is BB and is programmed to ignore things like missing details in "memories" or feelings of disconnectedness. I believe that he is meant to follow Kaz as a "role model for BB", Zero wants Kaz to take in the phantom, so it makes sense Venom would defer to the orders of others in determining "what Big Boss would do". He even explicitly asks for guidance.
So I believe that the no nuke ending is canon (they made it, and it actually ties into the life of MG1 and 2), but at some point, once Big Boss figures out Venom would be more useful as a direct pawn, and discovers the nature of Venom's programming, he takes advantage of it. In my opinion, if he was an actual replica, he wouldn't be happy to hear he was a "fake". Big Boss would reject that immediately, no amount of speeches about "sharing the legend" would make him back down on that.
So that is why I think it is clear that Venom can't be an actual replica in thought, his "sense" could not be changed. But his will could be forced to "follow what Big Boss would do, as told by those who knew him". At first it was Kaz, but what better true role model to follow, and voice to listen for orders from, than none other than Big Boss himself.
I think Venom only snaps out of it after years of mental and physical torment to toil away for Big Boss, and perhaps he was starting the Outer Heaven uprising early? Or maybe he decides "fuck BB", shortly before his death, but I think he had little free will to defy Big Boss for years, and once he may have realized the hypocrisy of BB's use of him as a pawn, he rejected Big Boss.
I like the theory that Venom was told to keep Big Boss' cover by trying to hide his similarities, but Venom started jeopardizing the mission and wanted Big Boss to be caught. I think it works better as part of the "revenge" theme if Venom turns against Big Boss after Big Boss orders him to dissapear and remove all evidence of his existence to protect his own ass. It's what "I" would like to have done, and since Medic is "me" its my canon. My legacy.