This is just based on peoples speculation because Killer really has no feats aside from messing with Urouge and his group attacks on the Pacifista. However, the way Oda has set up Killer plotwise being the only other non-captain Supernova aside from Zoro. Leads one to believe that they are destined to clash. Thus this leads me to the question whether you believe pre-skip Killer was greater than pre-skip Zoro? In addition, do you believe Zoro will have major difficulty with Killer post-skip?