CoC isn't just a matter of will anymore, it became a power level tool now. Basically, every top tier needs to have it to justify their strength.
By the way, it's something I've never taken into consideration when talking about Sanji getting CoC before, it never came to my mind. But now I realize his opponents would need CoC if he has it too and I can't see someone like Pizarro (or any other BBP outside of Shiryu and obviously BB himself) getting it.
We don't know if Admirals have it but Sanji isn't guaranteed to fight one anyway. Kizaru didn't care about Fleet Admiral position so he's not guaranteed to have CoC and I don't think any other Admiral could be his opponent. It's less of an issue in Sanji's case because his chances of getting advanced CoC are next to zero but it's still an issue even if we only talk about basic CoC. Unless he doesn't get it before EoS.
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Yes, yes, of course his flashback justifies perfectly why he has it. When I was making this thread and wrote this about Doflamingo, I told myself "sanjikun is 100% gonna come and protest to defend Doflamingo".
I meant it makes little sense to give him because of what he represents in the grand scheme of things. He's not relevant in terms of strength if you compare him to Yonko or top tiers in general. Also he was shit scared of Kaido and acted like his lackey, which is weird coming from a CoC user.