Pizzaro is likely Sanji's opponent still. Has too much AP for weaker Strawhats. He isn't Zoro's opponent. Robin fights enemies that go with her clutch fighting style. He got the most focus in Hachinosu compared to the likes of Vasco, Wolf, and even Shiryu. He fights Sanji or Jinbe. And given the other connections he has with Sanji, it is likely him