Nobody. In Kabr's time, fireteams were of only 3 people. Pahanin Errata, being the only survivor, brought back news to the vanguard, and that was when the decision for 6 person raids was made.
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But Kabr entered the vault before, with a fireteam nobody can remember because they were lost in time and wiped from history by the Gorgons
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Right. But the known fireteam was the three I mentioned. During that particular raid, it was just them.
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There is evidence in the armor that Osiris was there though