Presuming McKay put all of his research on the crystal back with Shepperd.
Because in SG1 1966 episode, it would of been his research which then allows Cassandre/sam to work out the exact time period SG 1 would come through the Stargate and the exact flare needed to send them back to their back to their past.
Because in SG1 1966 episode, it would of been his research which then allows Cassandre/sam to work out the exact time period SG 1 would come through the Stargate and the exact flare needed to send them back to their back to their past.
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