Interesting. There seems to be some merit in applying that reasoning to the Kurdish jambiya. I'm not sure the thumb along the side part would work well with the Kurdish jamb, just because the actual grip portion tends to be narrower than the parts that form the 'I' if I remember correctly. Now I kind of want a traditional style Kurdish jamb for a little learning and experimentation. I used to like the blade and not the handle, but now I want to get to know one better.