See I would be fine with that if the end had been to mock and humiliate Escharum at the end. This arrogant and stupid Xenos who thinks he’s hunting you and this is some grand fight where he can achieve “glory”. Only to end up unceremoniously killed and in a puddle of his urine. Hubris like that would be punished from a villain in another story.
Instead you’re supposed to offer respect to the guy who tortured your friend and put you through a death maze. The Chief has zero reason to show any respect towards Escharum and the Banished.
My take on them is that they’re little better than animals and pathetic in how self important they act. I’ve killed the Didact and bested the Gravemind. Why should I take a barely sentient Brute seriously? Never mind offering them respect.
The Elites were betrayed by the Prophets, having these Elites willing to be led by a San’Shyuum again would undermine the entire event of Halo 2. They have more reason to hate the San’Shyuum than humanity, which is why Halo 2 unfolded the way it did.
It would restore the status quo of the Covenant, making defeating them in the original trilogy pointless.