Crow is most logical technically, although I personally think Ana is a better choice. Ana is really busy with Rasputin, Elsie and Clovis, so idk. Also the Vangaurd is kind of wary of Shin, because he goes out kills dark Guardians.
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Shiro is the most logical choice. Caydes right hand man and proven field commander. Crow has no leadership experience, no mentoring skills and has proven to not put the City first. He’s about as unqualified as it gets.