User blog comment:Xilinoc/Ch. 540 - The Sword Five/@comment-5693502-20130605182822

It all makes sense when I think back to when Hollow Ichigo told Ichigo I am Zangetsu. Hollow Ichigo has always been there the true source of Ichigo's power. Also when Ichigo went to get FGT in bankai, Hollow Ichigo had to be torn from Ichigo's body instead of coming from 'Zangetsu' himself.

Good chapter !