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I've been doing some research on the dragon's head conflict, and, naturally, looked into the wiki-fandom page first thing. That's when I found some interesting information that I've never seen before, nor have I found anyone mention. The information is as following:
(After Chuuya punched Dazai in the manga):
Later, Shibusawa reappears, noting the streets are more populated than normal considering the ongoing war. He approaches a florist, asking her for a bouquet of white flowers, but the woman reveals a gun. The woman, alongside all the other 'citizens', is part of a faction Dazai leads. Dazai confronts Shibusawa himself, bluntly telling him he won't hesitate in killing him, and that, no matter how powerful the ability, a "one-man army" stands no chance against a juggernaut faction of ability users like the Port Mafia. This concept interests Shibusawa, who asks Dazai if "power in numbers" is why Dazai joined the Port Mafia, to which Dazai confirms. Their conversation continues, and in the end, Dazai states that while he can let go of the death of 'Colonel', he is not kind enough to leave Shibusawa alive. Shibusawa approves of Dazai's resolve, urging him and the Port Mafia to show no remorse. He states the conflict will not end until he is defeated. Dazai argues it will only end after everyone dies, and claims to know a way to end everything. To which, Shibusawa suggests "more conflict". Shibusawa compares the Dragon's Head Conflict to a conflagration - a large, destructive fire - and the only way to end it is to extinguish its flames with an even larger, greater explosion. A massive explosion goes off, much to Dazai's (rare) shock. Shibusawa explains he's arranged a war between the Port Mafia and all the opposing organisations combined and intends to destroy their headquarters. Dazai cannot believe Shibusawa arrived here, prepared to die, but Shibusawa informs him he made two miscalculations. 1- Shibusawa knew of the ambush. 2- Assuming Shibusawa belongs to no organisation. An array of different abilities attack, slaughtering the gunmen. Shibusawa confirms Dazai's claim: that the power of an organisation is incredible, as he found his way into one out of sheer boredom. Another assault hails down on the Port Mafia's headquarters. Oddly impressed with the 'White Giraffe', Dazai learns Shibusawa's name - and as such, the head of the Dragon's Head Conflict. A Mafia building crashes into the plaza, along with many other buildings belonging to different organisations. Despite all the organisations now participating in a single war, Dazai goes missing.
When did all of this happen?? The article provides no source for this section. I checked the manga, the dead apple lightnovel, even the dark era ln, and none mentioned anything about Dazai's confrontation with Shibusawa when he was 16. All of them cut from Chuuya punching Dazai straight to seeing Dazai captured and waiting to be rescued.
It still seems too detailed to be something fanon, so what's the source, exactly? And where can I find it?