I think that's up to your character. Sawada will certainly have his own agenda that may or may not go counter that depending on how the story goes.
He does but we are trying to keep the number low. At the moment only two of the 8 characters of Soul Society have Bankai. Death being one and Sawada being the other.3. The whole 'VC with Bankai idea'. First, if Sawanda doesn't have Bankai, this needs to be scrapped right away. Second, if we're trying to keep the Bankai numbers down, I won't go against that (although I will note that she will have attained but not mastered Bankai- channeling so much power injured her if she keeps it up).