Sadara is not more "Uzumaki" then bolt because 1st it isn't confirmed that she is indeed Karin's daughter even if she was no such thing as one person being less then or more then of any type of clan then another.She is more Uzumaki than bolt.
Karin didn't even live in the Village Kushina came from to which the Uzumaki are famed so honestly that makes her the lesser Uzumaki and makes Naruto more so by being the son of Kushina.