Totally get what your thought process is.
Ds results were also no shock and in line with mocks. 1 up (he thinks algorithm) and one down - drama but he knows he's not great at the written part.
Mostly from what I've seen and heard from kids at other local schools they also seemed to play fair - no one has presented results way above what they were doing.
However I'd also be interested to see the area as a whole and schools as a whole.
I think it's fair enough not to use for league tables etc.
But I do think parents of future pupils in these schools should also have this data. I say that as a parent who's child had to change school because of terrible ethos. I think parents should know which schools can accurately track progress well and guide students correctly and effectively based on honest and accurate data.
I'd also like progress 8.
Not to judge because that's not fair on pupils who had no control over their schools inflating results.
But if I saw a school with progress 8 roughly average for 4 years and 2020 was suddenly well above average I'd be more wary than a school who was constantly below average but remained so on 2020.
I have had a look (because ds had to move) at schools data previously and know you have to look at data as whole. The 2 schools I was looking at - 1 had increasing 4+ pass rate but consistent below average progress 8 and the other decreasing 4+ pass rate but average or above progress 8.
So of course cohorts do vary year on year but I wouldn't expect a huge change this year despite the grade reflecting a good day (I agree because you can't decide who will have a bad one!) - but I think trust in schools is important and this data will be quite illuminating!