User blog comment:B214/Volume 22 spoilers/@comment-83.26.181.159-20160802150728/@comment-9595671-20160804095818

There's one thing I should say about that though, nothing says that this system has already been implimented, it may very well still be a work in progress with Ajuka being the only remaining Satan for the moment.

Remember, the government's secret about the King Piece just got exposed, so it's likely there will be a slow and steady change of government where the Seven Satan system will be implimented.

Possibly so it can keep some like the Bael clan from running all of the Underworld like Zekram implied, especially considering the current Lord Bael. Change won't happen if they can't remove the problems that the changes are trying to fix.