The point of the topic is literally that the old visuals are not trustworthy, because it's clear that Oda is not planning things ahead with Haki.
Obviously one can agree or not.
Look, I agree that we can't tell for 100% sure what haki it is (I'm 95% certain it's armament haki) but I don't agree when you guys say that Oda is not planning things ahead with haki, especially since after the timeskip.
Oda drew conqueror's coating for the first time in chapter 966 (Roger vs Whitebeard) as thick lightning that trails behind the weapon/fist. He still represented armament haki after that as thin lightning for all other characters, including Luffy (chapter 983, Luffy vs Ulti). The representation of armament haki as thin lightning in that chapter (and for other characters) has remain very consistent with what we have seen in Dressrosa.
We don't always see thin lightning when it comes to armament haki but we have seen it during whole Dressrosa (Luffy and Katakuri), we have seen it in Ulti vs Usopp, we have seen it in Luffy vs Ulti, Jinbe vs Who's Who, Scabbards vs Kaido, and so on.
Maybe the thin lightning means that the armament haki that is used is strong and/or implies there is an armament haki clash.
Anyway, let's just wait and see. This changes nothing to Kizaru's portrayal anyway so let's be patient.
Chapter 966. Roger and Whitebeard using conqueror's coating (thick lightning that trails behind the sword).
Chapter 1010. Luffy using conqueror's coating (thick lightning that trails behind the fist).
Chapter 983. Luffy and Ulti armament haki clash. The lightning is thin.
Dressrossa arc. Thin lightning is used for armament haki and it can trail behind the fist.