Koakuma said: They wouldn't die in described ways without the help of Patchouli.
yeah I guess you wright, I'm starting to thinck that daibuesm is a disease that is spreads via bean paste that slows down the thought process in yukkuri. if my theory is correct that would explane why daibu kos are allways born from daibu parents. if my theory is correct how would one cure such a virus in a creature son unussal.
There are cases of "Deibus" being born from non Deibus, while we joke about disease and such, in reality Deibu is only the nickname for a shithead Reimu that resembles the Gesuaki's "Single/Lone Mother" Shithead Reimus, they aren't really some kind of special breed or anything, just a shithead with a type based nickname.
A Shithead can be born in a Nicehead family, same way a Nicehead can be born in a Shithead family. In Universe, there is yet no explanation for this, meta wise, it's just the authors feeling like doing stories of "White and Black Sheeps in families they don't fit."