Board Thread:General Discussion/@comment-24682793-20140523132734/@comment-11051098-20140523201617

No one knows for sure. Ichigo is a special case when it comes to Visored, because his inner Hollow is fused with his Shinigami powers, his Zanpakutô spirit Zangetsu. He was born with his inner Hollow, while the other Visored got theirs from Aizen's Hollowfication experiments.