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2) Compare the position of Renji's Bankai in this page: http://www.mangahere.com/manga/bleach/v17/c142/9.html.
Now compare what's left of it after Byakuya attacks him:
There is barely anything left, with even the head piece ground to dust. Mayuri's excuse that there was some of Renji's bankai that survived the attack seems almost baseless.
3) Arrancar release and Bankai release are different. Arrancar's swords are the embodiment of their hollow abilities. Zanpakuto are more of a reflection of their owners' soul that manifest into unique powers. As Thunderwitch said, detaching those arms instead of sealing them into her sword was equivalent to cutting her own limbs off.
However, Shikai can be repaired. What reason have we been given that dictates that Bankai cannot be repaired? This new, not-mentioned-before rule seems baseless and feels like the author's way of forcing the plot to explore Ichigo's shinigami power's origins.
4) Orihime couldn't repair Tsubaki bc she didn't have an understanding of how her powers worked. Thus she believed that she didn't have enough of Tsubaki to actually recover him. However, we see her resurrecting Arrancar from thin air.
As for Ichigo's cero oscuras wound, she couldn't reject, in time, Ulquiorra's reiatsu, which was preventing her from resurrecting Ichigo. There was no mention that it was impossible. More likely that she didn't have the time as Ulquiorra was right in front of her ready to finish the job.
Through Aizen, it has been established that she is capable of rejecting any event that has occurred. One limitation that has been canonized is that she is inefficient at recovering one's reiatsu. There has been no reason given as to whether and/or why she cannot repair broken Bankais.
Last edited by SuperSaiyan4; April 21, 2013 at 12:01 AM.