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If you ever get any weird PMs from me, just ignore it.
Been a while since I read Cole Protocol, but as I remember the Kig-Yar were under instruction from Truth to buddy up with the dissident humans to try and learn Earth's location.[Edited on 04.28.2011 7:42 PM PDT]
Simple. They both had something to gain. Its just Jackals were using the humans to get the NAV data and raise themselves higher in the Covenant hierarchy; so we got used.