How would Sidious, keep Vader in line?
Lets say that Padme still died and Anakin defeated Obi-Wan and didn't lost his body parts, meaning he has his full potential to fulfil. Now i am asking, how would Sidious keep Anakin under control, when he would fulfil his full potential. We know that he planed to betray Sidious even in ROTS, he says to Padme, - I'm more powerful then the Chancellor, i can overthrow him and we can rule the Galaxy, make things how we wont them to be- (something like that, don't have time to look for the real quote), not to mention OT Vader, who secretly planed to overthrow the Emperor. The only reason he didn't do anything, because he couldn't do it alone, Sidious was more powerful then him, that's why he wanted Lukes help.
But we also know, that Sidious wants power, more then anything, he never wanted to share it, he wanted to rule for ever. And he also knows, that Anakin has the biggest potential ever, even more then him.
But in this Scenario, Anakin fulfils his full potential, meaning he becomes allot more powerful then Sidious. So, i am asking, whats stooping Anakin to kill Sidious, because one day he would ask himself,- Wait a minute, why do i take orders from a weaker person, which i can destroy easily.
And why would Sidious take an Apprentice who would become so much more powerful then him and we and he knows the Sith are. (treacherous, backstabbing...) And Sidious didn't want, what happened to Anakin on Mustafar, he was clearly upset what happened to Anakin.
So, how will Sidious keep Anakin in line, (knowing full well, that the Apprentice wants to become the Master), if Anakin is more powerful.
Its just seems a stupid mistake on Sidiouses part, to me.