Yes
Call me insane but Oda not showing the moment (we only see the build-up to the laugh) where he actually laughs make me believe we're seeing it in the arc.
What made Kizaru laugh? Sentoumaru being the innocent child he is
Guess what character is like a child on top of having the literal power to bring joy and laughters to people
Yes, Oda will draw ever aloof and sarcastic Kizaru going down genuinely having the time of his life facing G5 Luffy and his shenanigans
Wild theory I know, but I think Oda is making Kizaru more human for a reason.