Vlaakith is fighting a two-front war against the Elderbrain and the Orpheus supporters.
As hereditary enemies of all things Illithid with the capability to take down nautiloids, Vlaakith and the gith are the biggest threat to the Elderbrain's plan.
The Dead Three do what all gods do in these types of situations - rely on barely competent lieutenants and not bother with a Plan B.
