Board Thread:Questions and Answers/@comment-24263585-20131207182614/@comment-7162800-20131208135746

I wondered how it could have been years since Nel left Las Noches, and didn't think that it could have been that Aizen was involved with Hueco Mundo before he left Soul Society. However, how did he make Arrancar such as Nel without the Hogyoku? I mean, it is stated that Arrancar can be naturally occurring, however, 'Perfect' Arrancar could only be created by Aizen?