I read you as claiming that the idiom used the word "amongst". That wasn't true when the word existed and it still isn't true now. The concept of honor among t

I read you as claiming that the idiom used the word "amongst". That wasn't true when the word existed and it still isn't true now. The concept of honor among thieves has been used in many ways. Whether you emphasize that it's present in certain contexts or that it's absent in other contexts doesn't change the way you refer to it.