Personally I say Ana Bray because I love watching Zavala get mad. And she's really skilled. I know it feels like replacing Cayde and they don't wanna but they gotta. they're receiving all this political flack from Lakshmi and FWC because they're in a place of weakness. So here's my list of hunter canidates...
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Hunters don't need a vanguard, not many hunters even in the city anyway, too busy patrolling and scouting things out. But lets make it Shiro-4, a good buddy of Cayde, and also someone we know from the first game already. Shaw Han wasn't needed and is just some noob filler character, kill him off.