I wouldn't actually mind playing as BIG BOSS, but only if he is just like Solid Snake was in MGS2. Because Kojima knows that we want Solid Snake and not Saladin.
It would be totally shocking if that "guy" is BIG BOSS, but it wouldn't excite me if I end up playing with him throughout. Its not the looks, its the CHARACTER that matters. In most movies, double roles take place, and you always want the good one to survive........ not saying "it doesn't matter, they both look alike"....
Bring Big Boss to the game would be awesome but not throughout. That would be a mistake.
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