Im confused as to why people believe hiruzen would lose when he has Large scale raiton??
I think the only one he can beat is kakashi.
Hashirama easily stomps
Tobirama is hypes as the best Suiton user in the manga and has FTG (Sends in edo to win)
Hiruzen has Enma (for protection), shadow clones, and large scale Raiton which will fry kisame (sends in shadow clones to win), worst case
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him and still gets the win.
Minato has FTG (Send in shadow clone to win)
Tsunade is Immortal, so kisame definatley wont be able to kill her with just Suiton, + she has Katsuyu.. Im almost certain that Tsunade has a higher chakra reserve than Kisame which means she can outlast.
Naruto wins with more ease then hashirama (sends in a summon to win)
The only one who loses is Kakashi