Well there is a comic book coming up called Halo Initiation, so we were probably going to get to see Jun in there and this little tidbit we are seeing in this avatar description is just a slip up.
Remember people the guys at 343i are these things called "Human Beings" which (I know is very surprising to you) are very prone to some things called "mistakes".
English
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When I see you write "mistakes" I substitute that with "painfully obvious mistakes that drunk children would avoid".