What the hell game did you play?
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This is silly, he's literally never held a lightsaber against another lightsaber, he has zero training in it.
Blast deflection doesn't count and he's barely gotten started in that either.
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But the time jumps are at the wrong point. Time jumps could only occur BEFORE the remote training scene in the Falcon, which immediately leads on to the Death Star approach. So that was conclusively the last training Luke got from Obi-Wan, and he's clearly barely gotten started.