Chakra levels alone wouldn't stop Kakuzu. The dude can literally tank anything in Hiruzen's arsenal accept the Raiton, which is counter-able by his own Raiton, and/or Fuuton.
Kakuzu is way to much for Hiruzen.
I disagree. Kakuzu had 4 elements whereas Hiruzen had 5. Kakuzu can spit out 3 whereas Hiruzen can spit out 5. That essentially means if Kakuzu ever uses his Futon mask (which he tends to do a lot), Hiruzen counters with his Katon, then shoots out his Suiton, Futon, Doton, and Raiton at Kakuzu, which he will have no counter to. His only viable options would be Katon and Raiton, both of which are useless in front of Hiruzen's larger scaled Raiton. And even then, Hiruzen could choose to not use his Doton mask and have another clone utilise Raiton, meaning 2 unsurvivable Raitons being shot at Kakuzu, rather than 1.
Edit:
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isn't comparable to
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. One was many times the size of Hiruzen himself, wheres the other was barely larger than Kakashi's hand.