Actually Yamamoto's shikai and bankai counteract Ichibei.
They'd evaporate the ink.
Zanka no Tachi burns things from existence. There's no way Ichibei could get his ink or blade to touch it before it ceased to exist.
If Zanka no Tachi East and West fail....Zanka no Tachi North is a distance slash which reduces things to nothing....so I mean Ichibei with his current feats can't touch Yamamoto.
All of the 0 division are supposed to be stronger than yammamoto
The five members together are stronger than the Soul Society.
It doesn't mean they are all stronger than him. Since Yamamoto alone is stronger than most of the Soul Society