Quote Originally Posted by Dusk Eclipse View Post
Wasn't it when Ichigo needed the power of the Ultimate Gatsuga to be able to stand up to Aizen? I took that as that the hollow and Zangetsu united under a common need. As such I guess that after Ichigo lost his powers they separated once more... or maybe Zangetsu's new look means he actually merged with the Hollow?
Really? I took that to be a sort of permanent thing, especially coupled with the realization that even Hollow Ichigo just wanted to protect Ichigo. Which kind of makes sense if you allow for a very liberal interpretation of that.

As for the new look, Word of God is that his shinigami powers fused with the remnants of his Fullbring.