In fact, what Jake was going through was normal for young people, and after he returned to the past despite his mentality being over 40 years old, he was still affected by his actual age.
So Jake was going through puberty again, but he was not as affected as the youngsters normally were, except that with that basketball subject even his mind being more mature he thought that what he was doing was not so sure.
The reason for this was the character of Jake who spent most of his life doing what was right, and even worse was that he felt that even having an 'advantage' over others was not yet enough to be better than the others.
It was only after this problem was settled in her mind that her abilities could improve normally could this be done by her parents or coach, but Eva already thought Jake was more mature than she was, and her coach was now another source of trouble for Jake.
So who had to figure it out was the system.
