This how Oda does COA in 2025 to differentiate from Acoc.

Saul uses COA, with maybe a bit of emission. No Pre-charge kanji or lingering lightning. In the past (2018 etc) Oda used to draw crazy lightning with armament Haki. Especially with characters who were conquerors.

That old 2018 shot of Kata has bigger lightning than Acoc Egghead Luffy and Zoro. Even that old 2019 frame of Ulti has big lightning despite it being armament. Even Doffy’s was massive back then when Acoc wasn’t drawn on panel yet.

However in 2025 Oda seems to show Armament without big lightning to differentiate it from Acoc.

Hence why Saul using COA has no lightning despite delivering a massive full page punch. Meanwhile Gaban has pre-charge lightning kanji, large lightning compared to his body, and lightning that lingers after impact.(Something only Acoc is shown to do).

I think it’s clear Oda is showing Saul has good COA and maybe emission while Gaban has Acoc. I think this another Garp/Yamato case where no one comments on their Acoc but it’s clear they have it.