I think people with disabilities or disadvantages in whatever capacity have the ability to hack the system and find the power to overcome these issues but maybe just in a different way than someone without these problems would solve this problem. I guarantee you, there are kids like me who've gotten fantastic grades at University levels without the scholarly understanding, effort, and aptitude that other people exhibit--but we find a way (and I mean more in taking advantage of the system rather than crossing the line to cheating).
Still looking at genetics, look at height--then look at all of the athletes who've defied "sports logic" and excelled in their sport despite the naysayers and their "disadvantage"-- Muggsy Bogues, Doug Flutie, and Martin St. Louis to name a few.
I think knowledge does come easier to some kids, but there are always people with the drive, ambition, and passion that find a way to persevere despite their issue. I know it's cliche but, those that want it, find a way.