Wow. I'm curious what are you guys feeding them? I know that the quality of food can greatly affect the rate of growth. In fact Snakebytes even talks about it in one of their shows.
That is large for a 2 month old. Does he have any others from the same clutch or know their size? If it's not genetic then it has to be that he's feeding them super gut loaded stuff and they're getting some sort of extra vitamins.
I know I am just saying that when they are both full grown they should be the same size. If not then I want it! You can selectively breed for size so that would be a good one for breeding stock.