To me it's really hard to believe that Kizaru is weaker than Akainu. Not only does Kizaru's DF seem more powerful (than any other admirals if not the entire OP) but Kizaru also seems like the most experienced fighter of the admiral's being the oldest. People think that one to the death battle puts Aokiji and Akainu above Kizaru and personally while I agree that it did bring them up a tier it's still unfair to rule out Kizaru's feats. Akainu's power when compared to Kizaru cannot be justified by the fact that his rank is higher. I'm sure that the only reason Kizaru didn't attain that position was because of his slow personality quirks.
Edit : While I'm on the topic I just want clear something up. Many people think Kizaru is "weaker" than Ben Beckman. Personally I'm sure that they are equals. A battle between them could go either way just like EL luffy and Lucci. At MF Kizaru's reaction did not imply fear but rather "oh crap, this guy is definitely someone I can't underestimate"
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Anyway : Barsolino > Akainu > Kuzan IMO