Exactly. Lord Oden did that,not Zoro. Unless Oden took over Zoro's mind through Enma and his haki, a panel with Zoro acknowledging that dealing with Orochi was useless is a must.
Come on, he killed Yasu right in front of him. Zoro swore he would avenge him with an angry face
Orochi vs Zoro doesn't need to happen, but Zoro won't leave Wano without confronting him, even if "just" verbally.