Okay - so Palaptine wanted to disband the Senate, but waited for nineteen years to do it because that's how long it took to finish the Death Star, and without the terror it caused, the local systems would split. But that doesn't make any sense. The Death Star was destroyed a few days after the Senate was disbanded, but it took years for the Empire to being to fragment - not until after the deaths of the Emperor and other high-ranking officials, and it could probably be said that it didn't really start to fracture until after Pestage was deposed. Then, there was the fact that though they couldn't actually destroy a planet before the DS, the Empire could definitely wipe all life out on worlds - and we know they did so. Wouldn't that have gotten the point across just as well and inspired just as much fear? After all, the mere act of Imperial forces occupying Kashyyyk was enough to shock the Galaxy into obedience into a few years before Yavin. So I just don't really get what Palpatine was hoping to accomplish with his Death Star. It seems like more effort than it was worth.