Spoiler warning
Recent lore indicates that Crow had a pretty bad time with the insurgents who went to the Eliksni camp. While any guardian has their devils lurking behind them the given fact is will he be able to resist the pull when Mara tells him the real truths about himself.
Will that speech during harbringer actually hold true or will he subvert back to his old ways?
My bet is old ways.
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The actions he took there actually show a protective kindness that Uldren really didnt have. He sees the eliksni as people of the city, he was friends with many of them, and his job as a guardian is to defend the people of the city. It's the situation he was in that was dark, where the people have to be defended from the other people. I doubt we see him act as Uldren again. We have seen too much difference in their actions.