User blog comment:Godisme/Thousand Year Blood War/@comment-2129789-20120208203418/@comment-1268838-20120209025731

Seeing as Ichigo emerged from the Shattered Shaft with the Hollow mask on, I'm pretty sure that Hollow Ichigo was around well before he actually became a Visored. After all, they met in Soul Society during the Kenpachi fight. Even then, it was implicated that they were one and the same.