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Are you surprised that the church tries to appropriate something?
Until he is killed, he still has the right of inheritance, he was simply expelled, but that does not mean he will lose his lineage.
He only saw fragments and I don't think he's hearing the voices of those who knew the Excalibur when it was still in one piece.
In a world with magical power for her to absorb, she shouldn't need to recharge. The author only kept this because he thought it was cute or something like that.
Could you be confusing it with Albion?
It may not be necessary to recharge it, just feed it, since in DXD there is magic unlike Kobayashi's everyday world.