As we know, the Luke who was being toyed with by Vader, and the one who beat Vader into submission, are on very different levels of ability. How much do we know about Luke's growth in between episodes? As in:
- What training did he engage in?
- What combat experience or other relevant experience did he pick up?
- When did he make his new lightsaber?
Also, I can't remember if Yoda kept training him after ESB or if he took ill before he could finish. In any case, how much do we know in:
1. Canon
2. Legends
__________________ “The galaxy must experience the pain of death and the rapture of rebirth as I have. I will bring chaos. It is time for war.”
But as of Legends there was a 9 month gap between ESB and ROTJ. From where he was helping track Boba Fett, deal with Xizor, among other things. He also learned from Obi-Wan's journal and self practiced with his saber abilities and force skills.
I believe there was also something about Vader actually trying, because it wouldn't make sense for him not to try, to actually test Luke....otherwise there would have been no point in trying to recruit him.
Registered: Jun 2013
Location: Darwin, Ground Zero
For whatever reason, Luke in ESB developed a telepethay (with leia) right after fighting Vader.
Just a theory but, you know how training is nothing compared to the real thing, what if Luke's drive to become one with the force exponentially grew right after the confrontation with Vader. Right after feeling the level of power Vader had and struggling against it.