I would like for someone to seriously confront Zoro's burning desire to push himself, despite the harm it has on him. Preferably Tashigi, who is the only one with any insight on Zoro's childhood. I want for Zoro to actually share more of himself to someone, even if it's indirectly. Kuina's death had a stronger effect on him than just inspiring him to take on her will. He seems adamant not succumb to human limitations. Limitations Tashigi's confronted by all too often. There's a lot of potential for growth for both of them.
If we ever see Zoro cry, it might be with Luffy to mirror this scene with Roger and Ray, or at least something similar.