Maybe at some point, Ziming was a leader (i cannot confirm, i don't know, i am just guessing) and then the story has changed. I think that's possible.
But from what i have seen, the character on the upper left fits perfectly, there is no mistake. The last character i saw could fit into that supposed Ziming shadow, that's how i feel about it.
Yu Suzuki told me that he was not one of the leaders so UNLESS he plan to change it during the development, Ziming is, right now, not one of the leaders, i am 100% sure.
He also said this :
"You can tell them the following names : Koutei and Gentei. I want fans to imagine them."
So pretty much, as a gift to all of us, he provided names so you could try to imagine how they look like.
Giving us everything through an interview, artworks, all story details would pretty much mean he's giving up and as you can see, that's not the case.
Let's keep pushing Sega or any other company that could make Shenmue III a reality because, trust me, Yu Suzuki is a genius and i would feel very bad if Shenmue III never get a release date.