I don't really understand how this chapter has changed anything? Anyone who thought Mihawk wasn't a better pure swordsman, was foolish. Likewise, anyone who thought Shanks doesn't have other things (better haki), was also foolish. I've always kinda seen it like Oda wants to leave it ambiguous or up to interpretation as to who the stronger character is. I think they're about equal. I don't think Mihawk is overall stronger though, simply because of how Oda wanks Luffy and anyone related to him. But...i repeat i have them equal. This chapter doesn't tell us anything, ultimately.