The purpose of Zoro stalling has already been fulfilled. It was so Guffy can get his 1 v 1/2 skirmishes against formidable foes, move the plot between Bonney, Kuma, and Saturn forward, let Luffy be the only one to rekindle Bonney's belief in Nika, and to kill off Vegapunk. Zoro's only legit W will have in Egghead is Lucci. At best he may clash with one of the Gorosei, but I don't see that going well for him if the fight goes on for too long.