We’ll just have to wait patiently to see where the Gemini storyline takes us, and in the meantime we can speculate non-stop about what these “massive” plans Plec has for Kai could be.
Even if they never make it to the screen, I have massive plans,” Plec recently told TV Guide.
When and if that storyline comes into play, it could surely provide ample opportunity for a visit from Kai.
Given that Legacies planted the first seed of a Gemini storyline sure to come, it seems like the show could organically create the perfect opportunity for Kai to pop in.