The Shadow Novel of Kelseer

I'm not 100% convinced that it has to be Kelseer. That's obviously what makes the most sense because he definitely has a huge role to play in Mistborn Era 2. But I also think that idea of following possibly someone else in the cognitive realm could be really cool. Like what if we had a shadow novel of the Vvenna slash Azure in her quest to find Vacher and Nightwing? In between Warbreaker and Oathbringer. Absolutely think that would be amazing. We definitely think that they have journeys that may have taken them to other Cosmere planets other than Nalthus and Rachar. So I am very hopeful for I guess the secret history sequels.