Depends how Egghead goes really, and if the Seraphim have a future or are just a one-arc sideshow to explain the Warlords being dissolved.
Oda wants to maintain the Seraphim hype currently, because they are up against our heroes. He might not feel the need to do that once Egghead is over. Alternatively, if the Seraphim don’t get beaten on Egghead Oda may want to show another character like Mihawk has beat them to hype up the difference in strength between Mihawk and Zoro that still exists.