Board Thread:Questions and Answers/@comment-7708862-20130402005255/@comment-2182964-20130403174104

Ulquiorra said that the release could destroy/damage Las Noches. Yammy's spiritual power is said to increase explosively once released, with himself stating he is stronger than any of the other Espada. Yet he didn't do much more than disturb the sand below him when he did release his Zanpakuto.

Hence the plot-hole. If Yammy's power was so enormous that it exceeded Ulquiorra's (and by Yammy's admission the other Espada) why didn't he harm the fortress?