Whoops, didn't see the bite pics, sorry. Why did the breeder single these two out for you? What do they say about the bite? What are your plans for the dog?
Size means absolutely nothing right now. I had a large 8 week old who is hovering at 55 lbs at 9 months. My male was an enormous puppy as well and is 75 lbs at 4 years.
Edit: who is the "Ghost" in your signature?