I think I can understand why they were cut.

It is a good concept though. If ever done right, it could create an opening for another unique enemy in the Haloverse.

The Promethians have a lot of windows open for them, and by extension, the Covenant have some too, but of them all, because Hunters can assemble into just about any form they please, there's a lot of opportunity there.

isn't it true that the Lekgolo would not be targeted by the flood due to their unique method of sentience?

That's something I've been wondering. See, as the flood advance, so too do their means of infection. In the early stages, they need a body with sufficient calcium deposits. Lots of bones. But as they spread and evolve faster and faster, eventually they don't bodies because they can create and influence things on their own.

Pure forms are a good example. They aren't based off any infected species, they're just a mass of bones and organic material that's clumped together. And eventually, the Flood alter the atmosphere. Filling it with airborne spores that consume and infect hosts who simply breathe any of it in.

Lekegolo colonies have no central nervous system, and they have no bones in their bodies. But an individual worm by rights should have it's own nervous system. And that means the Flood could infect it. However, doing so in the early stages of their rapid evolution would be pointless, as they need calcium deposits.

But I believe that if the Lekegolo were to engage the Flood in a more advanced state of evolution or on an entirely infected and altered planet, they'd lose. Infection forms could not infect Lekegolo. However, the spores of an altered atmosphere could.

And if this was an advanced stage of the flood, they wouldn't need bones anymore. They could use the Lekegolo as pure biomass, or even weaponize the eels themselves to incredible potential, either creating a literal tide and hoard of eels that consume everything in their path like an infection form, or even mobilize the infected into some warped Flood version of a Hunter.