I think Tite Kubo should explaine more about the following topics:
History of the soul society past & present
like list all of past & present soul reapers & give their history about them.
Explaine more about the court guard squads, Royal guard, Royal family, Kido corps, Onmitsukidos, central 46, Shino academy, Seireitei & other various places in the soul society.
Give us the history how Baishin & his history.
Give us the history on the Dark ones from the first movie.
Explaine more how to become a captain, Lieutenant, seated officers
I think by giving us this information it will clear alot of stuff up.