User blog comment:Godisme/Kill The Shadow/@comment-5186838-20120614080813/@comment-4957813-20120614164345

Yes, but Tite Kubo did not show how the captains were smart. Take Byakuya for example, rather than risking losing his bankai, why not have renji use his? Renji' would most likely be weaker since he does not have the experience or strength Byakuya does, and therefore losing the ability to use bankai would not have been as much of a risk as losing a captain's bankai