How can it be green when his first and third are blue?
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Why would they all have to be the same color? They're different lightsabers.
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What I'm thinking is maybe he took the crystal from the green cross guard lightsaber on Malachor at the end of season 2:
But the colors don't actually have "meanings" as you've described them, @Emiya4578. It was true that blue, green, and yellow sabers were once used by respective Guardian, Consular, and Sentinel Jedi, but those were never necessarily the crystals each Jedi originally bonded with. They were assigned by the Order, almost like when your job package comes with a company laptop, or how Jedi Temple Guards were still given yellow sabers after the other conventions fell out of practice. You could very much still be a Jedi Consular at heart even if you carried a purple saber.
I think @X0xRevan-RebornX0x has a much better idea, that everyone's connection with the Force changes over time. Taking into account that the colors aren't actually consistent with grouping types of Jedi, I think the last piece of understanding is that one lightsaber color might mean two completely different things to two different Jedi.
It makes more sense to look at lightsaber colors through the writers' perspectives. Ezra built his green saber when he was drifting away from Kanan, so having a different color than what Kanan used helps represent that shift. Sabine inherits the saber, and it symbolizes her desire to train and fill Ezra's place. Ezra then builds his final saber in greater resemblance to Kanan's as a way to show that his training is complete, and he has taken all of his master's teachings to heart.
I wrote a similar post a long time ago about lightsaber symbolism, and I think the narrative reason Luke's saber is green is because after learning of his true heritage, he can't cling to what he thought his father's lightsaber meant to him.
He has to build a lightsaber that's tied to his own destiny instead, and that's why it's green instead of blue.