Brian Gundy has a Normal ball python that he said grew bigger than any of his other ball pythons and he thought it was genetic. It makes me wonder if it's a specific gene that is co-dominant or if it gets diluted. For example, if you breed a fast growing snake with a slower growing snake, will half the babies be fast growing and half slow growing, or will they all grow a mid range speed?
It would be an interesting experiment in genetics. Perhaps it could be the start of a new 'Giant' morph LOL. From what I've seen I'm thinking it may be a higher conversion rate of rodent / food intake to weight gained, i.e. feeding the same rodent will make a 'Giant' snake grow faster because more of the rodent is converted into snake body mass. Seems like you could track the rodent weight vs. snake weight over time and compare the food intake to body mass conversion.