User blog comment:B214/Don't ask about season 4/@comment-93.139.190.182-20160711110322/@comment-1359322-20160712165901

I'd say the reason why there's no season 4 is because if they do a season 4 with the Hero Faction, it's like saying season 5 is coming.

Come to worst, if they want to avoid making fans think there's a definite season 5, they might just redo what they did in BorN, they'll blend up Volume 9-12 entirely.