As seen on [url=http://img139.imageshack.us/img139/5056/floodguts.png]Bungie's Christmas card[/url] the Rookie and N6 are the exact same size, so it is obvious that they are the same person, as already hinted at extensively in both ODST and Reach.
[b]Note: I've now messaged a forum ninja to close this, post at your own discretion.[/b]
[Edited on 12.14.2010 6:03 PM PST]
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That picture is so d'aaawwwww-worthy that it doesn't really matter. Also, the most important thing about that picture is that we get to see the back of John-117's head. Alsoalso, Noble Six is a robot. He detaches his head in the ending cutscene. Proof? Take a look at the Haunted helmet. Also, Cortana entrusted herself to him because she knew that the rest of Noble team was crazy and that Six was a fellow AI. [Edited on 12.14.2010 2:39 PM PST]