User blog comment:SenNoKuroiHonoo/Aizen's defeat- caused by Ichigo or his will?/@comment-2226235-20130401191210

No, Aizen's defeat was caused by the Hogyoku not wanting to stay attached to him because Ichigo was overpowering him. Aizen isn't the type of person who would enjoy a challenging fight. When he fought Ichigo he kept rationalizing how he could be loosing, not enjoying it.