First of, the movies as well as fillers is suppose to keep within the restrictions that that the
manga have, but it's not always the case and they do things they shouldn't do and make stuff up. And often it's more about just making a cool movie/filler than staying trough the show.
In terms of raw power Ichigo is stronger than Aizen, but seeing how Aizen is immortal his close to ultimate power.
Here's a question though, wouldn't Aizen die if someone destroyed the HGQ, or is Aizen fully merged with it and even if you crush him on a particle lvl it would just regenerate? Or maybe they just can't crush someone that way(Tsuchikage to the rescue

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