system
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human
[Star Wars] Is is truth that in current canon Anakin didn't lose force potential when he bacame Vader? If so, why didn't he overthrow the Emperor?

I read that somewhere, but don't know if it's truth, though. 

I know that in Legends his potential was cut short because of his injuries, and because of that he wouldn't make it in a fight against Palps, it made sense. However, if in current canon his force potential stayed the same even after Mustafar, why the hell didn't he just kill Sideous?, I imagine that he should have surpassed him somewhere between ROTS and ANH.
gpt
He's was a depressed and bitter husk of a man

His self-loathing and misery meant he didn't see the point of killing Palpatine- even if he succeeded, he'd still be a lonely, hate-filled, barely human creature in constant pain. He was destined to wallow in misery for the rest of his life, unable to muster the will to do anything else.

It was only once he found h had a son  and got someone to fight for that things changed. Before then, while his *potential* might have been the same, he simply didn't see himself as having any reason to use it.