It definitely needs more fleshing out for consistency. But I kinda fill those holes on Oda's behalf nowadays cause I know he will be picking and choosing to skip side character exposition till EOS.
Yep the man even skip parts of the first admiral fight you can see he won't be able do everything like that .
Back in WC's castle, a place full of haki users, no one could trace Sunji.
Back in Wano, the Scabbards practically sneak-attacked Kaido.
And so on.
Kizaru can move hyper fast, you need a very advanced CoO to really perceive him, Saturn was doing other things and the others are not really relevant.
I have seen far worse in the past honesty.
Of course the others relevant but since there VA and they have CoO they don't matter since they will notice him .
Also you need to stop with this needing very advanced CoO to really perceive him.
WB who CoO was gone cause he could not even tell that he would get stab stop him from moving at light speed while being half dead.
What does Scabbards practically sneak-attacked Kaido even have to do with Kizaru .
In fact all that show is CoO is work when Oda feel like it cause he notice BM get beat and she was miles away from him LMAO .
Let just agree to disagree on people seeing Kizaru as a beam of light when moving so he could not give luffy food.