Who is the Vicar? Is it Max Von Sydow?

Is this leaked concept art the first image of a character called The Vicar as possibly being played by the veteran actor Max Von Sydow?

What role does the Vicar play. How did he get this mysterious lightsaber and why does he let Poe Dameron have it? Why does Kylo Ren kill him? Is it because of the answer to the last question?

Is any of this true?

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“And you want to break in?”