I really can't see anyone from KotOR other than Revan getting a Legendary event. Definitely not T3, there's nothing particularly special about him, and there's little more to be said for Carth (though it is odd that he's been omitted from the list of characters that are coming considering his relative prominence among Revan's companions). Bastila would be the closest among them to being someone I could see getting that treatment, but even she falls quite short of it I feel.
These characters are mostly notable for being Revan's companions in KotOR, not so much for anything they themselves do. They're just not comparable to the characters that do get Legendary events, who are major icons of the films (most of them) or expanded universe (Thrawn). Revan himself would qualify as the latter, but his assorted companions, not so much.
