User blog comment:B214/General Discussion/@comment-81.157.0.208-20170918235836

Fan theory

What if there was a plot like ise gets called anonymously to an unknown region of the underworld between the maou territory and Bael territory and when he arrives he meets "Satan" himself who is father to the original four and after the devil civil war picked sirzechs and ajuka to take up their current Satan names and being impressed for being super devils who weren't Satan blood while serafall and falbium were picked for popularity and accomplishments. Also approved the RGs and evil pieces

So hearing about ise' year of events and probably being the youngest reincarnated to reach high-class, asked ise if he'd want to be a Satan or had any candidates for it when ise recommended some of the devils from his generation (e.g sairoarg, Sona, seekvaire even rias) satan said he'd think about it.