I don't really know the full out plans for Mihana but she will be present for the final battle, it's unavoidable. Currently the latest events have left her mentally stressed that she might even be forbidden from going for her own safety by the Twin Adder. And even if she's scared of abandoning her friends and allies when they need her most she still intends to go and fight. Calzien I want to pull into the time skip too but I haven't figured out how yet. He's a part of the Immortal Flames but went AWOL after awhile. I'd imagine the Flames would be more insistent on making a possible deserter either fight or face imprisonment so he'll have no other choice but to go. Cal hates fighting, but also has a strong sense of trying to protect others so he'd be there either way.
So yeah, I don't have full details set but both are going to be there at the final conflict for Eorzea's future.
So yeah, I don't have full details set but both are going to be there at the final conflict for Eorzea's future.