You are oversimplifying things to push your nonsense.
Kizaru did not do the Nika dance or whatsoever.
Kizaru ate pizza with his friends and then danced with them.
It just happens that one of his friends admires Nika.
When Kizaru saw Nika back, he did not stop fighting him, he still fought him.
If Kizaru betrays the World Government, it will be for his friends, not for Nika, stop your nonsense now.