Klemmer even says in one of the pieces that new Zari is not supposed to be likeable. So I figure this is all about manipulating viewers in rooting for Nate to get "his" woman back.
This interview explains some of Klemmers thoughts:
"Next season is going to have a slightly new configuration. I guess the way I would tease it, the same way that Maisie Richardson-Sellers got a chance to play someone quite different than Amaya, we're going to afford that opportunity to another Legend, which should be fun. Hopefully we'll be continuing Constantine but we'll be picking up sort of a new chapter in his backstory. We'll be spending a little time in Hell. I think we'll be getting back to the world of classic time travel adventures. We did a lot of fun monsters and horror movie genres, I think we want to get back to history a little bit. I guess we never want to do the same show twice. If we keep doing the show, every season should find a new group of Legends. I just want to change up the dynamic."
"Again, I feel like the Legends have slowly been growing up over these past four years, and I think we're approaching a point in the lives of at least one of the Legends where, I really liked the way they said goodbye in the past to people like Jax, where you have this realization, like 'You don't need this ship anymore! You can live life on the outside.' I think we want to challenge some of our Legends with with actually having to [live]. Hopefully Sara and Ava, that feels like a real adult, real world relationship to people. We want to keep them growing. It's a funny thing. You want the show to evolve but you want the characters to evolve too. It's hard, because we love them the way they are, hopefully. But you can't really stand still in life or on network television. So yeah, I hope everybody got their fill with 16 magical creature stories, because we're going to take a sharp left turn and I think we're going to find at least one new Legend next season. And who knows what happens after that?"