I have only one partially ruticated Boswell. I suspect I will avoid anymore of them until I learn a bit more.
I too think that the extra carving and darker added color was in fact due to a flaw in the Briar Grain.
I bought the one I have for two reasons, I was a newbie, and in this particular case, it was a more classic shape, and the irregular cutaway was actually very attractive. A fusion of sorts that has several design principles right.
I have wondered if the these issues, that are often treated in this manner, compromise the stuctural integrity of the briar. As I mentioned, until I am positive, I will not buy anymore.