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(I have not played halo 3 yet, but do some things about it, via halopedia)
My oppinion for the reason for expelling for the sangheili, is that it would take a lot of time and effort.
From what I can understand, the elite AI was poorly incorperated in halo 3, givin that the brutes were their target for working, and elites were secondary, hence no high ranking elites appeared in halo 3, not even the elite councilor render, which they showed on beta videos.
As for lore, it makes no sense, considering that the prophet Mercy supported the traditional covenant, considering that no brutes EVER appear around Mercies vanguard, not on earth, or on delta halo.
And another thing, even with the slip space blast, if there were any covenant left behind, their would at least be some sangheili left behind, whether in the rubble, or in the old phantoms still heading to earth.
But, because bungie did not work very hard on the Sangeili, Brutes FTW I guess.
(BTW what I mostly said is an oppinion, I could be wrong, anyway, I hope they introduce the old brutes along with the new)