Probably not really on topic but I'm just gonna say it, The Flood should have been ditched after Halo CE. They serve no necessary narrative purpose following the events of Installation 04 and have been the key gameplay problem with Halo's worst levels. Halo 2 and 3 would have been better had the story and gameplay just focused on the Human covenant war and stopping the "great journey" from occurring. It doesn't help that the flood's appearances in Halo 2 and 3 come out of nowhere with literally no explanation making their whole existence in those games convuluted.