What indication? Just think about it: she is capable to clash with Kaido(!) and not be sent flying like any other top supernova besides Luffy. That's just insane.
And Oda simply uses plot armor if he needs a SH to succeed in any tough situation. No need to uprgade everyone with CoC that's just lame.
you are sayin CoC is serious matter. Not . Because every powerful character is taking CoC. Think at some point , Sanjis bounty will be more than 1.5 1.4 billion. How people claim that sanji will not get CoC. We will see Kidd Law will get CoC . Katakuris bounty just 1 billion and he had CoC.
I mean not serious matter. If you have enough power and will , you can get CoC.
CoC was introduced as a birth feature. Unless Oda will change his own manga intrnsic odds logic that wise it won't occur most likely. It's not impossible, but improbable still. He would basically need to have a ton of coincidental factors to stick together, like so many characters put together with CoC that casually met as well as showing it just at the right time. He cannot exaggerate imo or it loses credibility.
Strawhats other than Luffy, Zoro, Sanji are very weak and their crew will be wiped out easily by any of the Yonkos. Jimbei and Yamato is much needed addition and strawhat crew starts to look like contenders for pirate King crew and there will be less PIS in the future arcs.