Thanks to Michael Kaminski, author of the The Secret History of Star Wars, for making this available on his web site.“In the Old Republic, all the systems sent their representatives to the Senate. It wasn’t an Imperial Senate; it was a Republican Senate, which made the decisions that controlled the Republic. There were 24,372 systems in the Galactic Senate. The Senate would vote in a Chancellor or an overseer who would work for four years as the leader of the executive branch of the Republic. You were only supposed to be able to run for one four-year term—you were only eligible for one term.
What happened was one of the Chancellors began subverting the Senate and buying off the Senators with the help of some of the large intergalactic trade companies and mining companies. Through their power and money, he bought off enough of the senate to get himself elected to a second term, because of a crisis. By the time the third term came along, he had corrupted so much of the Senate that they made him Emperor for the rest of his life.
Giving the Emperor that title for life and doing away with the elective process was all done with a lot of rationalizing. Many in the Senate felt that having elections and changing leaders in the time of an emergency disrupted the bureaucratic system. And the bureaucracy was getting to be so big that changing leaders made it impossible to have any effect on the system and make it work—moreover, the bureaucracy was running amok and not paying attention to the rulers. So they reasoned that the Emperor could bring the bureaucracy back into line. So the Emperor took control of the bureaucracy. The Galactic Senate would meet for a period that was similar to a year, but after it became the Imperial Senate, the meetings were less and less frequent until finally the meetings were only once a year, and they were very short.
With the bureaucracy behind the Emperor, it was impossible and too late for the Senate to do anything. He had slowly manipulated things; in fact, it was he who let the bureaucracy run amok and therefore had blackmailed the Senate into doing things because he was the only one who really had any power over the bureaucracy. It was so large there was no way to get things done, but he knew the right people; the key people in the bureaucracy were working for him and were paid by the companies.
When he became Emperor, a little over half the Senate as it turned out was not involved, was not corrupted—and they reacted strongly against the whole thing. There was a rebellion in terms of the Senate against the Emperor; they tried to oust him legally and have him impeached. But many of the Senators who were fighting the Emperor at that time mysteriously died. The Jedi Knights were alerted immediately and they rallied to the Senate’s side. But there was a plot afoot and when the Jedi finally rallied and tried to restore order, they were betrayed and eventually killed by Darth Vader.”
“When the Jedi tried to restore order, Darth Vader was still one of the Jedi. What he would do is catch the Jedi off-guard and, using his knowledge of the Force, he would kill the Jedi without them realizing what was happening. They trusted him and they didn't realize he was the murderer who was decimating their ranks. At the height of the Jedi, there were several hundred thousand. At the time of the Rebellion, most of them were killed. The Emperor had some strong forces rally behind him, as well, in terms of the army and the Imperial forces that he'd been building up secretly. The Jedi were so outnumbered that they fled and were tracked down. They tried to regroup, but they were eventually massacred by one of the special elite forces led by Darth Vader. Eventually, only a few, including Ben and Luke's father, were left. Luke's father is named Annikin.”
So this is pretty much the smoking gun that proves that Vader and "Annikin" were originally two separate people.
