Nobody gives a f*ck about him finishing his training. The movie started off with him being the sh*t- freezing laser blasts in mid air and sh*t, reading minds, freezing people, etc. Third act he's an emotional b*tch and getting sonned- and now he needs to finish training.
They made him to be "that dude" with the mask and voice while kickin' azz but then he's not sh*t. Which one is it? But nah I'm not lookin' forward to his side story. Its not interesting to me. I don't even see Han and Leia to be bad parents cause nothing was ever established prior that they would neglect a child to the point where their offspring would rebel and kill people and destroy planets. He just seems like a kid that needs medication and a shoulder to cry on. That's cool and all for a side character but if that's the main villain then