One of my twins is in DYS while the other is not. Having said that, the non-DYS twin has border-line (almost) DYS scores and at the next testing will likely get DYS scores (based on the circumstances and score patterns of the last Explore). Even if her next scores qualify, we apply, and she gets accepted, there will continue to be a significant differences intheir abilities.
I get I am trying to say that the issues are already there apart from DYS and that the DYS difference is the least of it. As the kids get older, there will be many instances where one kid shines above the others and they will learn to deal with it. For example, my DYS twin was jealous when his twin won a district art award. Then again, it won't always be the brighter kid who shines. My non-DYS twin actually got to represent her school/grade at the district science fair even though there is no question that her twin is far more able in science. It came down to who created the better product.