Seriously who wins, the 4 strongest Hokages VS The 4 shinobi Kages.
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you say Hiruzen will be useless due to his age yet at the age he managed to beat Hashirama and Tobirama at the same time,(which you also mentioned to be an incredible combo) I don't think minato has the strength to take down the 3rd on his own, the only reason naruto was able to win was because the 8 tails information. it'll be a tough fight, but the hokages will probably win in the end or all end up destroyed.3rd Raikage will be hell for the Hokages. Older Hiruzen is almost useless due to his age.
Hashirama and Tobirama, being brothers, must be incredible in battle together. Minato will fight solo against the Raikage.
Hokages win, high difficulty.