Orihime's and Shiba clan's story is background not development.
Orihime going to HM is char development but except "making the decision to protect everyone" there was nothing else.
Rukia facing ...that Espeda... is char development but after that she returned to being Rukia, Ichigo's senpai/mentor that needs saving.Like in this very arc.
The new enemies have zero char development. They are introduced, fight a shinigami, if we are lucky we get flashback where they arent even the focus, the shinigami turns the tables, die ->repeat with the next one.
Being the big final arc, the enemies are quite bad compared to the Arrancar, Aizen and Xcution.Orihime's brother had more in him as a character than these guys.