Jhin and the Kinkou order
By Jhin's taunts its pretty obvious that Shen's father had imprisoned Jhin at the ninja fortress and at the time Zed was a student (whom voted to kill Jhin instead of prison). Then skip ahead to Zed finding the forbidden porn shadow box, Zed becomes exiled then Zed returns and murders Shen's father as well as most the students and now the ninja fortress belongs to Zed and his shadow ninjas.
So where does Jhin's escape fit into this? I couldnt imagine Zed allowing Jhin to live, Zed may be a monster now but he still doesnt want the world thrown into chaos, he just wants everything to be done his way. I cant imagine Shen prioritizing saving imprisoned serial killers over his fellow students.
Speaking of the Kinkou order, are they Ionias secret forces to fight super villains? A-Are they the Power Rangers? o.O
Because if so, id be totally ok with that.