Maybe the statistically average kid managing to struggle through a shitty school has to work harder than, say, the statistically average Prince Charles with his private school and dedicated personal tutors.
We could fill the world with Maybes, but the one thing I’ve noticed about people who succeed, is that it’s generally their work that performs, while anticlass-based triage has only made hateful people reach high positions.
Maybe statistically gifted child is more often than not born to parents who were gifted too. Then, they read more to the child, speak more with him. And maybe either have higher disposable income, or liberty to recommend books, and learn with the child.
In the future, it's going to be a nil argument anyway, as world-class AI tutors are going to be available for every child 24/7 for a penny.
Statistical averages would tell you that you wouldn't have some schools getting 150 pupils into Oxbridge while others only get 2. But has long been the reality.
No, they absolutely might, because schools group a load of students together with similar attributes relevant to academic success (quality of teachers, school funding, wealth of the surrounding area).