Board Thread:Questions and Answers/@comment-10922879-20130617143901/@comment-11051098-20130624133521

True, he could age everything, so even Ulquiorra's Lanza del Relámpago wouldn't hit him.

I think Yammy's release form only had superior physical power because Uquiorra said any Espada ranked 4 or higher were forbidden to make their release within Las Noches, or else the dome would be seriously damaged. But that didn't happen with Yammy. I think the massive reiatsu of their releases would have been the cause of that, and Yammy in my opinion only had massive, superior physical strength.

However, if they do continue the anime sometimes, and do make Kenpachi's fight with the 3 Stern Ritter, and/or extend his battle with Unohana, I hope they make flashbacks to the fight with Yammy, and show us at least bits of it.