Coincidentally, Zoro meets Tashigi who looks like his supposedly dead friend. Marimo's whole quest began with his rivalry and promise with Kuina. Themes such as destiny, dreams, parallels, inherited will, and fate are deliberately at the core of this arc. I don't think its a coincidence that in one the sketches Zoro is surrounded by Mihawk and Tashigi.
Just picture, the end of the story, when it will be time for Tashigi and Zoro to pass on their will.