DuckLord5000
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i get it. i guess the problem is the knowledge of this jutsu. can shadow clone be sealed to use some time later? if its can then sure tobirama will not missed this. its said there a danger if you sleep while clone still active (not sure what danger though), so thats unlikely. unless fujin got something that can absorb chakra, say like samehada sword, make shadow clone with samehada then absorb someone else chakra then dispell to give back to real body.
not related; but i'm curious. can shadow clone generates chakra? just like Naruto when fight againts Pain, he keeps his 2 clones in sage mode, when dispelled his real body get sage mode instantly. the same purpose could make Fujin never run out of chakra.