User blog comment:Way2manybeer/Special war potentials/@comment-5551986-20130711222636

It must be people with unreal power. Ichigo fought with a superpowered up Hogyoku Aizen, they cannot take his bankai, he is a hybrid too, and has good potential.

Aizen he is immortal, a genius. Plain and simple.

Zaraki, he beat Unohana as a child, a beast by all means.

Even then we still don't know if Yhwach referred to the special war powers as possible uses for shinigami. So far he addressed only shinigami. So they could be potential threats. He may have some of his own war powers. I personally think he has his own answer to combating the Royal Guard, perhaps his own Royal Guard?

If the war powers benefit soul society I would suggest Inoue and the Soul King. Inoue because her ability can more or less revive people and refill the ranks. And the Soul King perhaps because so far they have listed exceptionally powerful people, absolutely out of the ordinary. Even though we don't know what the starry eyed weirdo can do, but I bet it is something pretty substantial.