Its the same for all.
The reason they did not use it is that.....Luffy could not and should not use it at that time.
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No the reason why Doflamingo and Katakuri can't use it is because they aren't strong enough even if the premise of CoC coating having levels is true
Doflamingo will never be Yonko tier
Doflamingo will never be Yonko tier