Ranked from most likely to least likely. The lower ones are really dumb.
He was Edward’s superior
Kai would have a lieutenant rank here. Edward left and Kai stayed and advanced to the rank of commodore. Nobody knows how much time was between Edward leaving and Kai becoming commodore. This is the least outlandish but still not likely to be revealed unless Edward specifically wants to get back at him. Plus if you blew up an entire town you’d want that to be secret too
He is corrupt and takes bribes
This is most likely. Edward Kenton’s navy reform puts him at odds with the big Kai, plus Order members aren’t going to be killable before their big reveal
He is colluding with the assassin syndicate
The red jacket unique to only him could be his other uniform which he can drop when he wants to go visit his people in the Red Corner. The Red Saber might not be a Navy Title but actually the title of a operation from the Assassin Syndicate. They love to put Red in front of everything. The Red Corner: their first hideout. The Red Council: their leaders. The Red Saber: the spy they installed in the Navy. Plus Whitesummit is really really close to silverhold. How hasn’t the navy stormed the base? It’s implied that if you escape the blackwater criminals the navy would know about the place. That means someone would have to be preventing the navy from taking out the red corner. It’s not like the red corner is well defended either
He’s a minor order member
I mean, if the order has people in all places of power, one of the first places you’d put someone is in the navy that spans the entire war seas. He’s probably not a Baron since we can already kill him
He’s killed a lot of people
You don’t get a title like The Red Sabre by doing good things you know. That’s a title you give to someone that goes way overboard on the killing
He killed the Vindicator user
The vindicator user mysteriously disappeared one day. Given that his gear is low enough level to be found in the bronze sea during the story, we can assume that this guy was a prominent figure in the navy and most likely around the bronze sea, which would be a shame to not have him as the silverhold Commodore. Commander Kai wanted that position and had to dispose of the guy first
He knows where Mimhere Island is
If he knew where this elusive island was, then he can assume that anyone who marches their way up to him to personally take him down is after his “secret,” and the one secret people will kill over in the high seas is the location of prestigious treasure
He had a relationship with Souvella
Now we’re in the really unlikely ones. But both shared the same rank and were clearly posted in the bronze sea. Also, I’ve never seen any other Commodores here so they’d have a lot of interaction. Plus that watermelon farm can clearly sustain two people
He’s the Kingslayer, Mistwalker
That mercenary with a blade so evil. This guy is known for his blade that glows with red energy. He could’ve been a mercenary before joining the navy, or the ghost is just calling him that. Personally I think it’s Avery. He’s evil, he killed a king, and he’s a swordsman. Or Torren.
He works with Calvus on the Winterveil Extermination
He clearly can find people anywhere in the Bronze Sea, and The Red Sabre is kind of a war criminal title. The bronze legion and navy clearly work together given by how they were gonna send Ruby Roger to the navy and not detain him. If Calvus needed someone who had the power to find and hunt down winterveil people, this would be him
The order tortured you in Silverhold under his watch
Your character doesn’t remember shit and Morden probably only saw the cell plus however they escaped from. Tucker is dead. Maybe Kai is telling YOU specifically that you found out his secret, and figured out that he brought you to Silverhold for the order. I mean, that’s the only other place in the bronze sea to put a dungeon besides fort Talos, and of we escaped fort Talos then Argos or Elius would’ve chased us down. Or my boy Roswell.
He’s Architect Merlot
Have you seen them in the same room? Kai could be only using his weapon and no magic, but his magic is where he got the title. Also we never seen Merlot’s face. NPCs awaken in strange ways so maybe he’s powerful enough to use both a weapon Aura and magic
He’s a vampire
Look at him. Tell me that doesn’t look like a Victorian vampire. Real Castlevania looking ass. Vampirism is clearly a thing in AO, based on the lost fighting style.
He’s gay
I said every possible secret