That's more or less what one of the Oxford colleges did. They realised all grades were guesses and that the information they had when offers were made had not c

That's more or less what one of the Oxford colleges did. They realised all grades were guesses and that the information they had when offers were made had not changed quantifiably. So they let all existing offers stand regardless of what grades students were assigned. I think it's a shame this was the exception rather than the norm.