User blog comment:Xilinoc/Ch. 540 - The Sword Five/@comment-8295743-20130605172815/@comment-5398287-20130605194018

Okay, it seems people are getting a bit confused about what happened to White.

To put it simply, he blew up and died. He is gone.

However, when he bit Masaki, he passed on a Hollowfication (which, according to Tosen, was his original purpose) and in the process a tiny bit of himself, which influenced Ichigo's inner Hollow.

Nimaiya is not using White to make a Zanpakuto, he is using Hollow Ichigo, a very, very different entity.

tl;dr White's gone, Hichigo is the Zanpakuto.