Honestly, I think if you are lucky he will stay that light, but he's probably going to get darker. Pastels don't get lighter as they grow. Most of those high yellow pastels you are seeing are babies. Only exceptional pastels are still yellow as they reach adult hood and those can be hard to find. My 1000g lemon pastel looked really yellow as a baby (at least according to the pictures I saw) and now her color is similar to his.
He has a cool pattern though and since he's also het albino you got a nice deal.![]()