I like your ideas, but I’m not convinced that Luke would leave for exhile and close himself off from the force without the fact that it was his direct mistake as a Jedi that caused Ben Solos turn. I feel like this personal family torment and on research, the reality of the Jedi legacy COMBINED is what causes him to cut himself off from the force and ultimately not rush across the galaxy and save Han Solo. He sensed danger for his friends, the pain, the terror and in a brief moment he reacted as he did when Vadar tormented him with Leia which reminded him that he is not Luke Skywalker - the legend - he’s just a man.