You dont suppose he might be willing to sell the big fella do you? BTW: sorry to repost your pic, but I needed it as an example.
:I posted this pic to show a friends ball python. The person has several large ball pythons just shy of the six foot length. The one in question was about 11.3lbs or 5.1kg. It is also around 20years old. Of course, this has a lot to do with fantastic care and cage hygiene and I can only speculate that genetics plays some part.