no, i was amazed by Zoro flashback.
until i saw Zoro able to coat his blade with CoC outta nowhere when he doesnt know he had CoC.
even though Sanji doesnt have CoC yet, i glad he might be the only one who doesnt get asspull PU (if Diable Jambe PU got explained by Oda later on).
To be fair, since Zoro's theme is all about becoming strong, basic CoC simply doesn't pay off.
The moment "weaponized CoC" was a thing, it was quite clear that, if Zoro had CoC as well, he would basically skip to the "power version" of it.
There are a lot of things that I feel are being rushed, due to Oda wasting panels with useless stuff. But I wouldn't consider the adv CoC part as "asspull". The only part I still feel was stupid was the "i didn't even know when I was using CoC".
Zoro used Adv. CoC during Ashura, which is the precise reason Kaido was surprised that Zoro could use it.
That I think was bad constructed.
But at least now, things are "back in track", IMO.