There was a reference to Hitler wayyyy back in heluva boss first true episode. But frankly I can just imagine him, ghadaffi and all the others rejoining up with their armies and confidante (Hitler, Goering. Goobels) and essentially picking up where they left of on earth..he'll THEM be behind the exterminations or at least the ones who gave Adam the idea. In exchange for protection when they happen.
But no why would we want demon zombie nazis raiding buildings with angels like when they were alive lining sinners against walls again JUST like when they were alive all while zombie Hitler watches from his own little reichstag built in downtown pride when we can have frathouse jerkwad Adam who looks like a middle aged dad simping for the the literal first thot, and mother of all thots.