Leah,
The keyword entires (value and itemnum) are copied to the keygroup table and also remain in the original keyword table. However, the Delete Orphans option is not something that would clean up the entries in that loose table. The Delete Orphans option is for dual table keyword types and will remove references to keyword values that are not used on documents in the system.
If you do have a storage concern about the keyword entries that remain in a loose keyword table after a key group migration, I'd recommend contacting your first line of support for assistance.
Ansley
