Now that we are two arcs post Wano it is clear to me Luffy was using AdCoC against Kizaru, we saw it in the opening kick [
x], and then when he landed White Star Gun [
x]
Oda just won't draw haki sparks all the time if the attack is not doing anything. This was evident in Kaidou vs Gear 5 as well. There were zero visual indicators of Luffy using ACoC against Kaidou unless he was landing attacks on Kaidou.