Nobody is talking about clashes or breaks in fights. You are assuming:
A) Luffy actually has the strength to fight Saturn right this second (its clear the focus will be on Bonney, VP, Sanji and Franky for now)
B) Kizaru is even remotely down
A) Luffy actually has the strength to fight Saturn right this second (its clear the focus will be on Bonney, VP, Sanji and Franky for now)
B) Kizaru is even remotely down
Only route is if dialogue delays Saturn actions.
B) Kizaru objective migth change now that Saturn entered into the fray.