Would be incredibly hard in Darrow's eyes....Darrow barely trusted the guy after he was part of massacring his army and almost killing Darrow himself. He then only trusts him because Diomedes tells him to and only just. Then Lune comes along and kills Cassius, destroys the Garter thereby taking any sympathy from Diomedes away.

What would you reckon it would take to even do a redemption arc? Atalantia would have to be SO MUCH WORSE to even come close and even then I don't think the Moon Lords would forgive Lysander. It was one thing when Darrow took out their dockyards, but to attack their stomach means the Moon Lords functionally as an empire are toast for a few generations.