If the Marines attack, then Luffy takes on the strongest World Government individuals, Sanji would have to take down the lower-ranking ones and Kizaru would be the perfect opponent for him.

Saturn recovers quickly from Kuma’s hit. He attempts to attack Kuma but Sanji and Franky interrupt. Kizaru attacks Franky but Kizaru appears to have a sad expression on his face after Vegapunk ...