This was underwhelming as hell, by the way. "That person" isn't even silhouetted but Vegapunk just talks to them and Kaku being "scared" of Zoro sounded way more serious in the spoilers than the actual panels.
Since Luffy overwhelmed Lucci I see no reason why Oda wouldn't give some fanservice for Zoro; I mean, it's not like anybody would believe Lucci and Kaku are a challenge for two main characters who already defeated them in their serious battles.