Not a grasshopper but will admit I have a lot to learn after only doing this for 10 years. I have not heard my mentors speak of this. I have only heard about looking at the dam of the stud you are considering. So if the maternal grandsire theory is well known in dogs, I apologize for bringing up something that is common knowledge to all.
I have used this method several times and it has worked quite well for me. Of course the dog that you are line breeding on should be a top quality animal.
