Not really sure why people say they want 2 Nanaly... if one isn't enough to carry you, chances are, two won't either (you're likely needing magic, true damage, or very high single hit physical damage aka Minerva instead). If you really need a 2nd dps archer for another path or something, Bashira is sitting there praying for that once-in-a-blue-moon opportunity. If anything, CRing Nanaly to make her cheaper is a great idea since you tend to deploy her very early.

Personally, I cr-ed my Nanaly twice with copies and a third with Fluer for mincost. Zero regrets, and I've never once thought, wow, a 2nd Nanaly would be nice. Not even with AW2.