Cortana has always been the human side of Chief. The side that allows regular Chief to be what he is- completely battle focused. Now that she's gone, Chief will have to have something else to take up Cortana's side. And that something should be himself.
I don't want Cortana to come back as I want the conflict between Chief- the hero vs. human conflict- to be expanded upon and developed.
Anybody else feel the same way?
[Edited on 12.12.2012 3:38 PM PST]
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Dude...Spoilers...