Bro Kizaru has heard of Nika probably but he lacks any visual knowledge.
That's why kuma is important.
He'll be the trigger....
Just wait ,no issues.
I'm 100% Kizaru will have a conflict once kuma wanks Nika.
There will be conflict because he doesn't want to harm his friends, not Nika
He spared Sentomaru, going easy on Bonney, etc
Kuma will be the catalyst for Kizaru flipping
I don't think Nika will have much to do with it
Nika has never been a big part of Kizaru's story at least from what I can see
I'll acknowledge that it's possible but I really don't think that's where it's going
Kizaru will realize that his job isn't worth killing his friends (hell, he practically raised Sentomaru) and protect them as they escape or intentionally stay knocked out so they get away