User blog comment:B214/Question and Answers/@comment-98.26.119.147-20140112152906/@comment-16281343-20140112161313

In Sirzech's case, he is too important to the Underworld that no one can replace him right of the bat, not unlike what happened in Bleach.

And no matter how overpowered Rizevim and Qlippoth seems to be, they won't be able to defeat and kill Sirzechs and his team that easily.

Take note, to me Qlippoth's biggest asset is Lilith and their is a chance for her to go to the good guy's side.