Yes, 3rd grade is way to early to predict that a dominant team will stay a dominant team as they get older. I have friends who have watched their kids play this team. The reports are that they are dominant because every kid can reliably pass and catch the ball in game situations. This is all you need to be dominant at 3rd grade. But as soon as 5th grade, every team will have every kid be able to catch and pass the ball. Then, you will need to be faster, quicker, stronger and more aggressive. Will this be true for this particular team in the future, who knows. Do they have have a better chance than any other team at this point? Probably yes, but future dominance is not certain yet.