I think the Sith Emperor of SWTOR is Ludo Kressh. Think about it: His flagship was destroyed during the Great Hyperspace War and it was belived he was killed, but this is Star Wars people! He probably survived. That is why the Emperor is targeted by Naga Sadow's spirit and his former apprentice is named Exal Kressh. Something to ponder...who do you think the Emperor is?