Board Thread:General Discussion/@comment-12611839-20130718170314/@comment-1268838-20141111145128

I do believe that yes, that form was the result of "Yhwach" temporarily releasing his hold on Ichigo's true power. Just as Aizen's Reiatsu had reached such a height that nobody could even comprehend it anymore, Ichigo's had gone even further, having so much that even Aizen could not sense it. Having Ichigo lose his own Shinigami powers is indeed consistent with "Yhwach's" motive of not wanting him to be a Shinigami anymore.