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Ah yes, because Splinter of the Mind's Eye is the highest order of canon, especially because it was a work written before the Empire Strikes Back came out and describes a lightsaber duel between Luke and Vader. *rolls eyes*
So where'd the Kaiburr crystal go, huh? What's that? It's bunk?
And your quote is not evidence, especially since you can't seem to source it. No incarnation of Luke is at Kun's level.
How the hell is Luke going to resist Sith spells that he's never even heard of?