The Thrawn Theory, as it has come to be known, is where Thrawn discusses to Joruus C'baoth and Pallaeon in Heir to the Empire about the events at the Battle of Endor. He states that the Imperial forces were not acting as true forces but were, instead, being supported by the Emperor's force powers. Thus, he basically says that the Imperial forces were incompetent and without the Emperor, they would have fallen apart, which they did. This theory is good and all, but I think it's just another classic example of the "Good Guys Have To Win" rule that infests most the SW universe, and most of literature and such, for that matter. I, personally believe that the Imperial forces at the Battle of Endor were forced to lose because the good guys have to win rule. I also think that had the story been a tad more realistic (without the stupid rule in place), the Imperials would have come out victorious. As a matter of fact, they would have probably come out 100% victorious and should have long since crushed the Rebellion...perhaps even with "one swift stroke". Of course, to keep within continuity, the Thrawn Theory is the only thing that makes sense...as much as I hate to be forced to say that the Imperials relied that much on the Emperor.... For people who hated Jedi, they sure did rely on the Force a lot.... ARGH! Another reason I dislike GL....