MGS5 a Prequel? Doubtful (Minor MGS4 Spoilers, Sort of)

Kombo writes:

Those of you who have played and conquered Solid Snake's latest adventure know that Kojima and co. managed to tie up the series' plot threads so tightly that not even an Eagle Scout could untie them. (That's why they have knives). Those same people -- MGS fans, not Boy Scouts -- know that MGS3 is the best game in the series (Yeah, I said it). So, following that logic, another MGS prequel only makes sense, right? Wrong. First, let's check out the quote from Ryan Payton.