A'Sharard, maybe? Although he seems to be more comic territory, and Windham already covered that in his Obi-Wan book. So he'd most likely just be name-dropped if at all. Asajj could work -- she'd actually be great seeing is TCW was canned before they ever completed her story -- but I doubt JJM had any idea where her story was going while the book was being written. So again, probably mentioned but I'd doubt we see her. Those are the only reasonable two I can think of off the top of my head, aside from all the MIA Jedi wandering about. Is the possibility of Jerec playing Indiana Jones Corellia Antilles out in the Tatooine deserts reasonable? An Inquisitor like Antinnis Tremayne or Adalric Brandl obsessed with bringing Obi-Wan to justice? Zombified Siri Tachi out for revenge?