I am kind of staring to feel like everything that has happened from Episodes 1-7 has been a direct result of Yoda's declining mental and physical health. The Yoda we find in episode 5 is a mere shadow of his former self and I suspect that while Luke might have been "ready" to take care of himself he was in no way ready to be a teacher of anyone.
Is it possible that Luke's vision in 5 wasn't about what could be but more of what will come to pass?
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