Board Thread:General Discussion/@comment-31283382-20140611172614/@comment-5553481-20140611215140

Darkhunter said most of it...

1. "Hollow Ichigo" was/is Zangetsu, who changed his appearance due to hollowfication, and now looks like Ichigo. No, it is unknown how he looked before, or whether he did, he could exist straight away as a hollowfied zanpakuto spirit, due to White's influence moving from Masaki onto Ichigo during childbirth/pregnancy.

2. Asauchi is an "empty" blade that needs to be filled with a zanpakuto spirit, it is NOT a zanpakuto spirit.