Most people think Aaron does count as the 6th. I still don't because we already knew about Aaron + 5 others when they were trying to make us believe that Jin was the 6th. If I'm right, then we still don't know who #6 is.
ETA: Actually, now that you mention it, the whole "8 initally survived the crash, but 2 later died" testimony further lends credence to my theory that Aaron doesn't count. That means Jack was talking about 6 people that survived the crash. Unlikely that that would include Aaron.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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