Minotaur and the Lunar Bull
I forgot I posted this on BA and likely been under the piles of post by now. And I need to keep track of my own brain...
Uliquiorra's release is likely a Minotaur. Yylfordt release was a Bull:
Chapter 200: Night of the Sledgehammer Ichigo mistaken Yylfordt Hollow as Uliquiorra's Hollow during the second attack.
Minotaur and the Lunar Bull
In the myth of the Minotaur (Bull of Minos), the Bull, which is primarily the temporal-theriomorphic representation of divinity, is combined with that of the cosmic man, whose earth bound representative would of been that of the king incarnate Asterion/Asterios, the eternal principle within the temporal realm (virgin birth motif), symbolized by the Labyrinth: the place of the Labrys (double-axe).
Death of the Minotaur
While inside the heart of the labyrinth, Theseus becomes one in death with the Minotaur, as the god who is both slain and slays himself. Through the death of the bull, Theseus, within the cosmic threshold in the role of Solar hero, confronts the unbridled force of divine power and virtuously remains unscathed (much like the Cretan king in his meeting with Zeus in the cave), himself clothed through death in the same divine splendor.
Lunar Bull... Yylfordt stands besides the Moon:
Chapter 200: Night of the Sledgehammer