I think the lesson of the original trilogy is that Luke doesn't necessarily go the light side route entirely. He doesn't let go of his attachments. In fact, they may have made him stronger.
They sent him skirting the dark side. The lightsaber battle on DS2? He starts pwning when he gets pissed about his sister, then realizes "oh **** this is dark side stuff" and says "I'm not fighting you anymore because I am TEH JEDI". It's when he lets go of everything that he's victorious (just like with Obi-Wan on DS1).
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