The linking themes in BJ vs Adlers: (please add yours if you think I missed any !!!!!)

Ushijima, Kageyama and Hoshiumi are all rivals of Hinata waiting for a rematch

Atsumu, as a setter that doesn’t adapt to his spikers’ bad habits, is the perfect setter to show the evolution of Bokuto

Hinata and Bokuto are master and disciple

Ushijima, Hoshiumi and Kageyama are all players from bird-related schools playing in a bird-related team

Ushijima and Kageyama are Oikawa’s rivals

Sakusa and Ushijima have a shared story since middle school

Sakusa represents the « being healthy isn’t a given » that Hinata learnt

Atsumu finally tossing for Hinata after his promisr