I can be convinced of this
I hope you realize this chapter changes literally nothing to Saturn being the main villain of the arc and Luffy's main fight.
Luffy has to stop both Kizaru and Saturn and he punched Kizaru away.
Some people may tell you this is leading to Luffy vs Kizaru round 2, maybe Luffy ends up clashing with Kizaru again, maybe there is some truth in what they say?
However, we both know where this is heading towards. Luffy punched Kizaru away so he can focus on the main villain.