So in terms of the commander unit, I wouldn’t be surprised at a Boba Fett, purely for the reasons that:
Luke and Vader, in some ways counter eachother. Their command hands have a similar 2 attack. They a balanced give/remove suppression. They are both heavy hitters mainly looking for Melee.
Leia and Veers do the same but in a support fashion. Their card abilities bring the core trooper units into the lime light, in opposite ways. Dishing aim/dodge. Building on precise/nimble. Their command hands also mirror eachother.
so the question here is, is that a theme between commanders to keep the balance? In which case, will the Imperial answer to Han Solo be a similar gun slinger/long range damage dealer. With this in mind as the assumption, is there anyone else apart from Boba Fett in the OT that can do that for the Imperials?