Board Thread:General Discussion/@comment-12611839-20130718170314/@comment-5657895-20130718190130

To put it bluntly, Mugetsu is a Plot Facilitator and Bullet that Kubo used to dig himself out of the mess he made during the Karakura Town arc. He needed a quick way to get from point A-B while still trying to contain the unbelievable levels of power Aizen had reached, and thus Mugetsu was born. A cheap way to finish Aizen and move Ichigo on to his next arc, completely disregarding the whole idea of Ichigo getting strong enough to beat Aizen on his own, or find the ture weakness of Kyouka Suigetsu.