I think many fans have this misconception about flowing CoA in that they conflate it with barrier or internal destruction. Barrier and ID are a form of ACoA, flow isn't. Flowing CoA is a basic CoA technique that is the mechanism behind coating any weapon. Yes, flow is relatively basic application of CoA.
Tashigi can use flow
helmeppo can use flow
half the fodder in amazon lily can use flow
Flow is not ACoA. So in regards to Kid, imo there is a 90% chance that he can use flow. As if he couldn't, that would mean his haki is functionally useless as he couldn't harden his metal. And when even amazon lily fodder can do this, I find it hard to not give Kid the benefit of the doubt as one of the strongest supernova.
"but but Kid can't use hardening because Oda never drew his metal with the black ink"
Yeah Oda doesn't do that all the time. We've got outright confirmation that Sanji was using CoA(both recently and in WCI) despite Oda never using the black shading. There are countless examples in the manga of characters confirmed to be haki users not having their blades blackened with CoA. Like Law, Oda has never used the black shading on Law's sword. Do we just assume that Law can't use haki on his sword now?
The reason why Oda doesn't use the black shading is because
Tashigi can use flow
helmeppo can use flow
half the fodder in amazon lily can use flow
Flow is not ACoA. So in regards to Kid, imo there is a 90% chance that he can use flow. As if he couldn't, that would mean his haki is functionally useless as he couldn't harden his metal. And when even amazon lily fodder can do this, I find it hard to not give Kid the benefit of the doubt as one of the strongest supernova.
"but but Kid can't use hardening because Oda never drew his metal with the black ink"
Yeah Oda doesn't do that all the time. We've got outright confirmation that Sanji was using CoA(both recently and in WCI) despite Oda never using the black shading. There are countless examples in the manga of characters confirmed to be haki users not having their blades blackened with CoA. Like Law, Oda has never used the black shading on Law's sword. Do we just assume that Law can't use haki on his sword now?
The reason why Oda doesn't use the black shading is because
- Kid's use of flow isn't as good as some other users(zoro, scabbards, ect.)
- having his metal black like that would be visually unappealing