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Wait, so Luke fought Vader for the 2nd time on Bespin (which makes no sense, but I digress), and still came at him like an idiot? And you said Luke survived because of a crystal. At least Obi-Wan Kenobi had the sense to take advantage of an opportunity when he saw it. I don't see Luke winning against a Jedi who was said to already be ready for the trials of knighthood at the time of his appearance and who also dealt death to an extremely combat-oriented Sith Lord.
a kyber crystal increases someones connectivity to the force, and some seem to be able to do other things to like healing people. It also appears to work as a crystal in a lightsaber, because Luke experimented with the one he found and put small shards in his lightsaber. Obi-wan did not beat Maul alone. Qui-gon did atleast 70% of the work, Maul just got lucky and finished him.