User blog comment:Xilinoc/Ch. 540 - The Sword Five/@comment-1904799-20130605203940/@comment-3177613-20130606094643

I believe that the connection between hollow Ichigo and White is this: when Ichigo was born, he inherited his parent's reiatsu, for his father, he inherited his Shinigami powers,and for he inherited her Quincy powers and White's Reiatsu, but not White's soul, meaning, that through Ichigo had hollow-like Reiatsu, he did not have a inner hollow inside him. When Ichigo went through the shattered shaft training, he gained a hollow soul, which fused with the hollow Reiatsu already inside of him, creating hollow Ichigo.