Board Thread:General Discussion/@comment-5085906-20130627191357/@comment-6747658-20140620160554

http://www.konami.co.uk/2013/11/13/metal-gear-solid-backgroundz-1-snake/

"Naked Snake (who’s real name is Jack but is often referred to as John), also known at Big Boss or Punished Snake, was similarly a Special Forces soldier."

Since this is on the Konami Blog, can we conclude that this is definite proof that Big Boss is Punished/Venom Snake?