Kizaru or Lucci doesn't matter, Nika treated them the same way except for
white star gun and the fact Kizaru made Luffy run to exhaust him plus the papercut nothing changed.
-used giant form against both
-clashed with both equally
-laugh at both making it seem like he is having an easier time
-kizaru was dazed by a nameless Coa punch from miles away and Lucci almost lost consciousness from the named attack but recovered instantly, and processed to tank 2 more named attacks.
-in the end both outlasted Gear G5 Luffy
It's why I'm not that invested in Kizaru, he also already got tarnished by Nika. It's possible that they still fight but nothing short of Zoro one shooting with advcoc will be satisfying.