This is what i think, the reason why is simple. They are there to not let luffy and momonuske to open the borders of wano theres something about this that probably would affect inu sama and the gorosei.
and all the answers lies on the poneglyph that law got and the unknown poneglyph from wano.
one scenario that i think might happen is that cipher pol will try to kidnap momonuske, and kill the straw hats. But someone might appear to stop them, like shanks, gaban or some unknown man who protected oden’s journal i mean who knows everything is possible at this point.
and all the answers lies on the poneglyph that law got and the unknown poneglyph from wano.
one scenario that i think might happen is that cipher pol will try to kidnap momonuske, and kill the straw hats. But someone might appear to stop them, like shanks, gaban or some unknown man who protected oden’s journal i mean who knows everything is possible at this point.