User blog comment:SenNoKuroiHonoo/Aizen's defeat- caused by Ichigo or his will?/@comment-2226235-20130401191210/@comment-5745799-20130407141852

Um, the loneliness Ichigo felt coming from his blade could be from Kyoka Suigetsu and not Aizen. Remember, Zanpakuto need their master's acknowledgement, and Aizen never once seemed to acknowledge it, causing it to feel loneliness.