If Haikyuu!! included a subplot focusing on a character’s struggle with injury recovery, it could add depth to the storyline by exploring themes of determination, resilience, and overcoming obstacles. It would provide an opportunity to showcase the mental and physical challenges that athletes face when dealing with injuries, as well as highlight the importance of patience and support from teammates and coaches during the recovery process. Such a subplot could also serve as a source of inspiration for viewers who may be going through similar challenges in their own lives.