I don't think Luffy's reaction means Kizaru is the strongest character he ever faced considering how inconsistent COO is in this series, but it being the chapter ending cliffhanger is mean to be genuine hype for Kizaru's strenght at this state of the series, that's it.
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zoro is the strongest ally on the island right now
kizaru is on the island, luffy is not
this is zoros fight
kizaru is on the island, luffy is not
this is zoros fight