SPOILERS (Don't read if you haven't seen the movie)
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>The Emperor, who was Darth Sideous, is inferred to be in complete control, all the way to Episode 6, due to his ability to forsee the future. The ultimate goal was never Vader, but Luke. Luke was a far more powerful Jedi than his father (final battle, Episode 6).
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>The Emperor more than likely knew of Padme's twins, and their births, but withheld this knowledge from his apprentice, until the time was ripe to pluck Luke. Vader was a violin, that Sideous played to perfection, until Vader's last spark of humanity resurfaced unexpectedly, due to the love of his son, much to the chagrin of the Emperor.

Very interesting. I didn't think of the fact that Sideous wanted Luke to join the dark side (and I assume replace Vader cuz there can only be one apprentice). I remember that Sideous wanted Luke but it didn't occur to me that that was Sideous' plan from the start. WOW very cool.
Thank you for posting your thoughts Tommy. Meditate on this I will.