A combined reference to Gohan's tutor Mr. Shu, who constantly disciplined him with a whip, and the novel Romance of the three kingdoms, where the Shu faction is constantly associated with benevolence.

Uhm, it's Dragonball Super logic not Z.

absolutely :)

mhm ok, watched DB & DBZ original in german dub. Maybe they did not describe some things correctly.

Yeah,did they changed the meaning of Kaio in Dragonball Super? Wasn't paying much attention in DBS.