Well we’ll only have our main team there for a day at most, and I’m not willing to lose half the roster to the Flood just because... Flood. So our super geniuses will make it work.
Also, Silver. Telekinesis is the perfect way to hold something down for study.
eh, debatable. the Flood were pretty formidable in the first Halo, and that was just them basically being mindless, their only goal being to start gathering biomass in order to create a Proto-Gravemind. They nearly succeeded until Chief blew up the Pillar of Autumn and destroyed Halo.
in Halo 2, we see the Flood acting far more intelligent, working in groups, displaying attack strategies, and utilizing vehicles.
we have our super geniuses, sure, but the Keymind bests all of our characters in terms of intelligence. basically, the only way we can beat the Flood is through sheer power, and even then, taking on Abominations is no easy task. every single one of those guys are like a mini-boss battle. imagine taking on Caponek, then multiply that by... well, as much biomass as the Flood have.
i originally didn't plan on the Flood to be so formidable, but it's kind of hard to not when they control the whole feking galaxy by the time we come in. in Halo Wars 2, the banished dealt with the Flood with slight difficulty, but with a Keymind, the Banished are gonna get their asses handed to them. the Insurrection, too.
if we can just develop a cure, which we can, but it won't work, then that defeats the whole purpose of attempting to activate Installation 07. when activating this ring, it'll kill everything in its blast radius, and along with that, it's setting are set to activate the other Halo rings, so the only portion of the galaxy free from this blast would be where Installation 04 was previously located, though in order to simply wipe out the Flood, i'm having the Keymind calling literally the entire Flood to Installation 07 for the final battle.