i used the same strategy as the wind, but with water and worked quite well for 55k power

sage naruto - iruka - sage naruto clone
water main - gaara - x
x - x - x
main set on healing, chakra blade chase, neurotoxin and poison

in the first round use gaara to remove the barrier of danzo
in second round iruka interrupt sasuke, and when naruto gain chakra use rasengan on danzo and main heal if gaara gets chaosed by fu
in third round gaara on main, and then the poison should do the trick

I'm struggling here too right now, doesn't seem possible to beat it for water main with my power. I've got a lineup that can beat it but i think i miss 3-4k power for it to work.