I seem to remember a TTK mission, on Venus, that has you enter the Vault of Glass. Ya know, that mission where you get the No Time to Explain. What was it called again? Paradox? Yeah, that's right. And in this mission isn't there a guy narrating throughout, who's skeleton you find at the end? I think his name was Praedyth? And I think I remember him saying something along the lines about how he and another Hunter, Pahinin? Pahalin? Phaline? Something with a P! had entered the Vault of Glass with Kabr, and Kabr was intense sometimes... and doesn't Ikora say she knows Praedyth's name, from various pieces of gear and scattered text? From this mission alone, it stands to reason that when an Oracle changed the fireteams reality, they made it so they [i]ceased[/i] to exist, and all memory of them was erased from everyone's minds. But, they only ceased to exist from that moment onward. Not what you suggest, which is that the Oracles made it so they never existed in the first place. Another thing to take from this mission, the Oracles only made 3 fireteam members stop existing, though they altered the reality for all 6. Kabr forgot about all his comrades, but continued to exist. Pahinin (I honestly don't remember how to spell his name) escaped the Vault and became "insane", and couldn't remember his comrades. Praedyth (if I recall correctly) got stuck in an infinite time loop that the Guardians break in Paradox, but his memory ws never altered by the Oracles. In other words, you are incredibly wrong. #TitanMasterRace

Except that in the mission paradox praedyth clearly talks about entering the vault with Kabr and Pahanin. "Kabr was intense sometimes and Pahanin was always talking to himself.".