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There are loads of what ifs?.
We have seen that dust release can be absorbed therefore ive little doubt that samahada can do the same. Also if mu is in the water that kisame usually creates when he fights, if kisame as to merge with samahada he gains sensoring abilities and im not sure if its great enough to sense mu when he goes invisible
Ill give the upper hand to mu, but it can go either way
it cant it senses chakra and muu's completely vanish.