"either Yellowtip or a lot of other posters are going to look rather silly."
Why?
I don't think anyone who is wrong looks silly, they are just wrong.
Nerf, I saw that, sorry if I didn't make it clear that I was only responding to your later point.
It is complicated by the fact that the mistakes are layered. The question needs to be applied to each mistake, really. That's where it gets tricky.
If the rules had been applied fairly and impartially, Perma's DD would not have been offered a place.
If the rules had been applied fairly and impartially, Perma's DD would not have had the place offered, removed.
If it comes down to 'which was the bigger error', I think they need to consider the impact of each error. The removal of school place has a far bigger impact because there was legitimate expectation of a place, so far as to remove almost all chance of the 2nd choice school appeal being successful.
Perma's DD is GS material. It just happens that there were at least 2-300 people who were also GS material ahead of her.