User blog comment:Xilinoc/Ch. 543 - Letters/@comment-5462417-20130628051914/@comment-11051098-20130629111806

It would be a logical option. If it's not a resurrection of Kira or, more likely, Unohana, it's most likely experimenting on a dead Stern Ritter to gather information. And I bet he's also examined Driscoll Berci's Medallion to find out how those are able to steal a Bankai.