Hello prime hiruzen fan! i am going to disprove prime hiruzen with one panel.
its not the panel you think (obtio killing hiruzen, dead hiruzen)
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now, look at how hiruzen is dumb enough to use the wrong nature types to block spiral, instead of using the superior type to finish him.
those aren't particularly large scale attacks, compared to
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we have seen.
prime hiruzen has 0 feats, and regular hiruzens only 5 feats are in that scan. compared to others, such as kisames water bubble, and kitsuchis mountains the size of the juubi, madara's meteor, the massive sand thingy gaara used to stop the meteor, ect.
that fight wasn't spiral zetsu VS eco hiruzen, it was spiral zetsu VS the entire shinobi alliance, - gaara, minato, naruto, sasuke, kakashi, guy, lee and sakura. including at least 3 extra kage. the only reason that hiruzen was the only one still fighting was the buddha statue was draining their chakra, while hiruzen had unlimited thanks to edo tensei.
I'm sorry, but prime hiruzen just neutralised himself. (that fanfic jutsu isn't even unbeatable, yagura would beat him)