yes, because zoro called sanji nr. 7 before that scene. so what you are arguing requires alot of unnecessary assumptions regarding off-panel conversations anyway
Which makes more sense than an Island Radar CoO Zoro. The logical assumption is that Oda doesnt really care how the SHs know this information. But even if you discount that, Zoro and Sanji spent a lot of time off-panel
- Zoro and Sanji first meet
Off-panel: Sanji could've told the order of the SHs to Zoro
- On-panel: Zoro calls him nr7
Off-panel: Sanji talks with Franky, with Franky easily telling him that Robin arrived
- On-panel: Zoro literally asks him what they're talking about since he fucking doesnt have Island lvl radar CoO to see
Off-panel: Sanji tells him Robin arrived, so Luffy must be last
- On-panel: Zoro calls Luffy nr9
This makes more logical sense then anything to do with CoO at all. Oda never hinted at Zoro using CoO once at all. And Zoro is literally still asking what Franky and Sanji are talking about, showing that he was constantly seeking info from Sanji.
Like I said, this is information the viewers know.... so Oda doesnt really care if the characters somehow know or not. But even if we discount that, then Zoro still could easily get all his info off-panel.