User blog comment:Xilinoc/Ch. 579 - THE UNDEAD 6/@comment-6916556-20140507185035/@comment-1268838-20140507202110

Firstly, just to note, Asauchi are not closely related to Hollows. White in specific was similar to Asauchi because he was created from the soul(s) of Shinigami. So White was similar in composition to Asauchi, but not all Asauchi are similar in composition to Hollows.

That being said, it is a fun theory, but I somehow doubt that any Zanpakuto can manifest itself in that manner. Yachiru's Shikai was unique, but so have been many abilities we have seen throughout the series.