Originally posted by DarthadiThere's really no good explanation for Luke's exponential growth as of now.
Actually. If Luke with only a few years of training could be at the same level as Vader who had 20+ years of training (not to mention his training and knowledge of the force were better than Luke's) wouldn't this be the proof that either Vader lost potential after Mustafar (either because of injuries or, more likely, psychological reasons) or that for some reason he was not at his best during ROTJ?
I'm really curious if they would give as some form of explanation in the comics. Who knows, maybe it will be something similar to Rey downloading knowledge from Kylo, lol.
As mentioned, canon states/implies that Vader never lost potential, and his power only grew over the years. He was indeed conflicted to some extent in RotJ, but Beware the Power of the Dark Side! states that he cast those emotions aside, and legitimately wanted to either kill Luke or turn him to the dark side -- his feelings towards Luke were initially hate/fear... So I don't think his conflict was inhibiting his abilities much at all there.
Strange as it is, I think Luke was just on Vader's level by then(which canon also confirms.) HOW Luke ascended to that level is the real question -- one that I hope is fleshed out in the comics.