Board Thread:General Discussion/@comment-26475399-20150621155411/@comment-26475399-20151021150933

Not necessarily saying that he has planned for everything that has happened up to this point. I'd say he had everything planned out intricately, only up to his defeat. Anything after that would have been him simply working around obstacles. We already know that he's capable of reading several steps ahead of a situation. Though he planned a majority of the events before his defeat, his will was greatly aided by the Hogyoku. The Hogyoku helped him break the barrier, although Aizen alone is very, very proficient.

So during Aizen's imprisonment, he had nearly two years to mull over what was gonna happen next. I'm sure he was confident that his sentence of 20,000 years wasn't even gonna come close to even a fraction of being served. And if he really always has had some knowledge of Yhwach and possibly the Wandenreich (which i think he very well could), then that would give him great insight on knowing what to expect when he got out (by whatever method that may have been).

So it's not that he really must account for everything. It's just that he is good at weaseling out of things. Having been imprisoned, this would be the ultimate test for him, in that regard.

And we don't know for sure yet that he genuinely has committed to joining the fight against Yhwach. It's been awhile since that happened in the Manga, but unless i'm not remembering correctly, he hasn't given any confirmation or hint of allegiance to anyone. Just that he's trying to be convinced into doing so. Otherwise, he's probably going through ideas in his head on how to act alone.