Box of Bunnies
Banned
Portable Ops isn't canon anymore?
As soon as Kojima came back for MGS4 it was shunted in to a weird "we're not going to explicitly say it didn't happen but we're not going to refer to it anymore either" space.
Really it set up Big Boss getting the idea for Outer Heaven well enough that I don't think he needed any more games, but Kojima painted himself in to a corner with Old Snake and seems to have a hard-on for Big Boss so here we are anyway with Peace Walker and now Phantom Pain.
Metal Gear stories are stupid and campy enough that paying too much attention to canon is kind of silly anyway. That's my only concern with MGS5 really, is that Kojima seems to be reaching outside his abilities as a writer and it's going to try to take itself too seriously.