very interesting chapter and the posts here are great. we now know for sure that skull knight is the former king gaiseric, he sacrificed a woman (looks like fairy queen but could be schirke's mentor).
maybe the king didn't become godhand, because there were already 5 of them up there and no one looked like skull knight, he could be a simple apostle or an existence separate from godhand, or maybe a friend of him became godhand (void) like others said here