This might as well be crack so don't take it as a close to factual theory cause there's like a 0.1% chance of this ever happening lol. Though for my own personal enjoyment I like to play around with senerios of Rashomon being the Dragon but to explain that ig I kinda have to get into theoretical territory.
Which I'm not very good at so bare with me.
The only actual Dragon we know of in bsd is the Red Dragon singularity from dead apple but personally, I don't think it's much of a stretch to believe there could be a Dragon ability that parallels the Tiger. I believe if there is a Dragon ability it will be reminiscent of the Dragon singularity we see in dead apple as fits like an opposite to the Tiger thematically.
We know Atsushi's Tiger is the antithesis to all abilities and it's implied the dragon is it's opposite; the chaos of all abilities. Atsushi as an antithesis seems to be something of an anti-ability, which I think has something to do with how Atsushi can physically cut through abilities. The Dragon we see in dead apple is like the opposite to that, it's an amalgamation of many abilities. Something than can destroy vs something than can elevate. The dragons ability to strengthen other abilities seems to come through merging with or consuming other abilities, this trait reminds me a lot of Rashomon, Rashomon is the only ability (as far as I know) that is seen being able to fuse with another so effortlessly. Case in point, sskk's "Beast Beneath the Moonlight–Rashomon".
I say all of this to propose the idea that the Knight state Akutagawa went through was something of a temporary merging between Bram and Akutagawa's abilities and consciousness (abilities are tied to consciousness after all). Which in this hypothetical, perhaps it's a hint towards other unique skills of Rashomon's maybe it'd be possible for his ability to fully consume or merge with another oneday.
After all, Atsushi is a character known for breaking ability rules as well as Shibusawa (another character who's tied to the Dragon) perhaps Akutagawa could become the first user to truly wield more than one ability? That part is really where the crack of this theory comes in lol.
Anyhow thank you for reading my rambles and have a good day 🫡
