Kizaru = Kidd
Luffy = Shanks
The scenario will be the same where Kizaru will use his speed and Lazers to threaten Luffy’s crew and Vegapunk, but Luffy doesn’t yet have FS on the level of Shanks to deal with this, so he will need to improve his CoO. Once Luffy does that he will probably one-shot Kizaru using FS to predict where he will be and pulling off some new speed based G5 ACoC move.
Luffy = Shanks
The scenario will be the same where Kizaru will use his speed and Lazers to threaten Luffy’s crew and Vegapunk, but Luffy doesn’t yet have FS on the level of Shanks to deal with this, so he will need to improve his CoO. Once Luffy does that he will probably one-shot Kizaru using FS to predict where he will be and pulling off some new speed based G5 ACoC move.