Board Thread:General Discussion/@comment-25417848-20150425222815/@comment-25375217-20150426002110

It's possible he didn't appear on set because 1) he only appears in studio scenes so no one saw him, 2) he's CGI so his voice actor recorded in a studio, or 3) they were referring to his appearance as a cloud of smoke in Lily (seen in the promo), so it was only a voice actor again.