Board Thread:General Discussion/@comment-28197279-20160413015311/@comment-3423279-20160417162120

Seems to be more then a head wound in the manga, if Orihime can repair that then who knows what is possible, plus Kensei and Rose are technically freshly dead still, as Giselle and later Mayuri's zombification things seem to keep them relatively intact.

Charlotte died after Yumichika's true Shikai drained him. Mayuri brought him back as a resurrected Arrancar, not a healed one.