Board Thread:General Discussion/@comment-6747658-20130225232210/@comment-1672596-20130228160410

199.255.1.20 wrote: I disagree. I took that as perhaps a way of altering the storyline, which was never canonized in any game, maybe for future titles. I'm not saying you're wrong but I found it to be an interesting choice of words.

That was taken from the MGS4 Database, actually. As far as Rising, Koreikado stated the game is canon, even if it isn't a Solid game.