Oh yeah duh lmao. I can't believe I forgot that one.
Blackbeard is a mythical zoan imo. Hence why he's not found a 3rd fruit either. His 3rd is gonna be an actual logia instead and he's gonna invert the kuzan betrayal and titanic theory by killing Kuzan and taking his fruit for himself.
If BB really can't sleep due to coldness in the past, maybe some kind of psychosomatic hypothermic condition where he believes he's constantly freezing and OR he's so traumatised by cold in the past, that he developed thus condition anyway due to it, like a "phantom limb pain" kind of thing?
Oda threw some major breadcrumbs by having luffy talk about people not being able to sleep due to coldness, Buggy mentioning Blackbeard not sleeping, Blackbeard attacking drum for unknown reasons (to get hiriluk I mean doc q maybe), oars dying of frostbite/hypothermia in a freezing country of villains too. Also BB has a crew of all DF eaters and has embraced a new crewmate who is a former major enemy and Admiral, with ice powers who can instantly make icebergs like the one that sank the titanic...drowning is inevitable for DF users in the ocean too ofc.
Now for the final crack conspiracy theory part. Ringo is said to be so cold, that bodies can be frozen and thus preserved there for centuries like Ryuumas.
Where did Oars die? In a freezing cold country of villains...Where is Onigashima? In Wano. What is Oars? An Oni.
Oars has 3 skulls on his belt, who has 3 skulls as his motif, on his flag? Blackbeard.
I think Ringo MAY be where Oars died. Remember Moria got Oars body from somewhere? He also stole Ryuumas body, Shisui and at least Captain John's body too. Maybe other Rocks Pirates too but seems like Wang Zhi is written out of that possibility now ofc.
Kaido an Oni too and a VERY proud one was rivals with Moria and Moria had his crew slaughtered in the new world, implied to be by his own former rival. Why would Kaido do it? If he found out Moria stole his ancestors corpse and was pulling a weekend at bernies with it, defiling his corpse, death, legacy etc, then Kaido would be FURIOUS especially as he takes death and his Oni heritage VERY seriously too.
I don't know if Moria got John's body from Wano too but maybe? He was probably killed at Hachinosu though imo.
@MonsterKaido
I think BB will either have a clone of imus DF, the ultimate devil fruit/mythical zoan, maybe the original DF to exist too. If they're born from deep desires and Imu is the wrath of the sea personified just like the DF curse is the wrath of the sea too, then maybe the yami yami is actually the abyss of the sea itself, "dark water", or its voidness itself or simply the literal devil incarnate.
Yami Yami was called the most evil fruit, that makes it sound sentient too. Like zoans apparently are too. It sounds very lovecraftian too with the whole subtle cosmic horror vibe it has too. I just realised BB has an attack called dark water or something like that I think, that he used vs Luffy in Impel Down iirc?
I know it's nonsensical rambling but there's a method to this madness somehow lol.
For all we know Imu, Xebec or whoever could also be Davy Jones is inherited his will too. Maybe Blackbeard has? I also considered BB might be a failed clone of Xebec somehow hence why he has a strange body too and maybe why be can eat more than 1 DF too.
I'm sure Blackbeard's logia, the yami yami is either a mythical zoan in disguise like the nika reveal OR the yami yami is constantly hindered by constant exposure to light, especially sunlight even and BB needed that blanket to go full logia form and take WBs DF too somehow.
Somehow his fruit can nullify other DFs too. That isn't right at all. I wouldn't be surprised it something can nullify haki entirely out there too. Maybe science related lol.