Because he just got back the battlefield and named attacks require warm up + set up and he just wanted to quickly stop the very fast Kizaru from bisecting Kuma/Bonney?
It legit takes effort and stamina, and Luffy has to handle both Kizaru and Saturn too. Luffy burning too much energy in G4/G5 is the very reason he shits out in G4 and part of the reason G5s cooldown hits like a truck.
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