Originally Posted by snakethzero
I think most of the ideas here are off, when isshin had appeared in the series he seemed to have just recovered his powers. Lets face it he never even released Engetsu into its shikai form unless its like Zangetsu which is always in shikai but why no bankai?? Either he held back on purpose to help his son gain power and become more mature or he was unable to tap his full power due to just getting them back.
Its my guess he is from the royal guard it would explain why the Gotei 13 has no knowledge of him being within they're ranks but I have a feeling the last arc is going to let everything out in the open.
Or it could just be that Isshin WAS a substitute like Ichigo and he had to use the final getsuga tenshou in the past to stop a powerful enemy and lost his powers as a result.
Either I cant wait to findout.
He deliberately hid himself from the Gotei 13, so its very likely they could know him. Chances are 'Kurosaki' isn't even his real name.....
His sword is probably always in a released state. Its just that he seemed to hve only gotten his power back recently, so he couldn't use bankai...