Halo 5 Legendary Ending

If you’ve beaten the game on legendary, or if you just looked it up, then you now what I’m about to say. If you haven’t seen it, spoiler alert.

The halo ring is activated, but i want you to listen to the humming. then think about all the characters who hum. to me, this sounds like the humming that Guilty Spark does as you advance through the flood. anybody?

I thought it was Cortana but I heard it might be gravemind

It is fairly obvious the Gravemind has fully corrupted Cortana the rest of the way beyond the incomplete stage the logic plague took in Halo 3. Now Cortana has gone full Mendicant Bias under the Gravemind’s control, either that or the plan backfired and the Gravemind is now under her control, indicating Cortana is effectively attempting to use the Halos as leverage to get Gravemind and the Flood to serve her purpose.

But I don’t understand cause, installation 04 was a direct threat to earth and the ark cause it can activate all the halos at once, they are both destroyed so cortana would have to move this new halo for it to be really dangerous, right?

Hoping Halo 6 puts me on a ring. Gotta love that nostalgic feel!