It does look like a ball to me. While 4100 grams is rare for a male its not impossible. I had a normal male that was 4200 grams but he was close to 15 years old and never missed a meal. But besides him I've never had another male exceed 2800 grams. If you are looking to ad albino gene to your collection I'd say go look at him. Be a good chance to ad some size and yellow to your gene pool.