AscendantJustice (firstname.lastname@example.org) writes:
Bungie has never liked the idea of Sergeant Johnson being immune to the Flood. Joseph Staten says so here. They retconned it in the HGN. Turns out, to them, it makes more sense that he's just one helluva badass soldier. So they dropped the immunity. This begs the question: Why is it so important that Avery Johnson not be immune to the Flood? I see two possibilities.
1) Immunity to the Flood lowers their potency. If a symptom of a syndrome is enough to grant a strong resistance to Flood control, could ONI replicate this? Bungie doesn't want that to be left open.
2) The Good Sergeant gets Floodified in Halo 3. Why else retcon his immunity? Could make for a powerful moment in dramatic storytelling...