Shouldn't Xin Zhao look a bit older?
He was already an established gladiator by the time J2 got to him. Even if you say he was a teen at the time, many years still have passed since he started serving J2, then his death, J3 becomes king, then his son grows and it hits the present timeline
Unless, J2's grandson was born and grew a bit before J2's death. Totally possible
Just some thoughts I wanted to express. What do you guys think