How did he survive his supposed "death"?
My personal theory is that Toya literally died on Sekoto. Dabi is just a Noumu made from Toya's corpse by Dr. Ujiko. After his creation, Ujiko removed Dabi's memories of him and All for one, thereby making him a "sleeper agent" for AFO.
I think this is the most likely simply due to the whole thing of endeavor only finding a piece of Toya's jawbone. How did Dabi burn so much of his body off that his jawbone fell off, and yet he still survived? The only rational way this is possible is if someone revived him. Imo this is exactly what happened.
My personal theory is that Toya literally died on Sekoto. Dabi is just a Noumu made from Toya's corpse by Dr. Ujiko. After his creation, Ujiko removed Dabi's memories of him and All for one, thereby making him a "sleeper agent" for AFO.
I think this is the most likely simply due to the whole thing of endeavor only finding a piece of Toya's jawbone. How did Dabi burn so much of his body off that his jawbone fell off, and yet he still survived? The only rational way this is possible is if someone revived him. Imo this is exactly what happened.