In ozymandias, what is the best summation of the theme of the poem?

From the text, "Sometimes a dream needs a push" by Walter Myers, Chris' dad had a wish that his son would become a professional basketball like he is but his dreams are shattered after they get into an accident and doctors inform him that Chris cannot walk again.

Chris' dad took it badly as he blamed himself for the accident because he was driving and because of the guilt, he stopped communicating with his family as before and became distant.

Eventually, Chris is allowed to use a wheelchair and he starts to play wheelchair basketball which his dad is not fully in support of until he begins to attend more games to watch his son play, he then began to coach him on how to become a better wheelchair player.