Forum:KB:Rebellion leaders' capture

At the end of The Force Unleashed storyline, Galen Marek sacrifices himself to save Bail and other rebel leaders from the Emperor and Darth Vader. Apparently this is 2 years before ANH. So what gives? Bail doesn't go to the senate anymore? Leia's allowed to run around the galaxy? Why doesn't the Emperor and Darth Vader just arrest them since they know who the plotters are? Any help here would be hot!