The thing is at this point, all these points you are bringing up are all so hypothetical. The schools are looking their cohort's exam results, interviews, school reports and teacher statements now, making their selection list. There's nothing anything anyone can do about it until you hear directly from the school so comparing your child to previous children's CAT scores etc is kind of by the by?
And then once the offers are out, you need to factor in the fact that schools are all over offering, and using waiting lists because lots of children apply to multiple schools and those families will all have their own preferences based on their own personal circumstances.
There are so many different, subjective factors that come into play here, it just doesn't matter whether you think other people's children are over tutored or not tutored. It's just a selection process to get them all to the next stage.