Change in the Vader/Sidious-relationship after ROTS???

[Tychu]

At least since DarkEmpire we should know, that Palpatine intended to rule the empire forever, by living forever and using clones of himself as carriers for his soul/life-essence, call it, whatever you want.

But as far as i know, Palpatine didn't have the knowledge and the means to do that by the time of ROTS.

So if he wants his empire and the Sith-legacy to last, he has to build up Darth Vader as the future master of the Sith, hoping, that his apprentice will continue, where he had to stop because of (sudden) death.

But as soon as Palpatine discovers a way to achive physical immortality, he no longer has a need for an apprentice to succeed him. In fact, Vader becomes expandable.

So how does this effect their relationship? Is Vader even aware of that change in attitude of the emperor?

And what are you thoughts on the matter?

i think Vader becomes aware of this between EP V and VI when Palpatine plays him up against Xizor, he feels that Vader is expendable and dosent really need him during this time in SW history