I dont think thats enough. It still only creates a tiny niche for theives while having to protect said thief all the way to the target you want something stolen from.
Just give The Blade Dancers some form of "You can dance for one person but it doesnt use your turn and you can Canto to a target and attack it"
The Sword Coryphee "You can dance and Canto away but you cannot attack" Higher caps than Blade dancer
and Soloist gets a form of stat buffing skills like Ninian and Nils' rings.