What role will The Flood play in Halo Infinite?

If the Flood come back in the upcoming Halo Infinite, what role will they play in the upcoming sequel? Are they gonna play a very big role or they will most likely appeared later in Halo Infinite?

My guess is they’d appear later in the campaign, at least I hope so. I hope they take inspiration from Halo CE and Halo 3 if they reintroduce the Flood.