Your all looking at this too deeply. They are not going to have a deliberate meaning to this, its meant to psych us up, and get our juices going. As for GD, its G... D... , and its not really related to anything. Its something the raisin was about to say before he fell asleep. The whole point of this message was obviously to just tell us of stuff to expect, it doesn't have a hidden meaning.
Though it makes for interesting theory, anything that this may relate to that isn't immediately obvious to you will be from characters you don't know about yet.
Reese
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