The 2020 cohort is going to have to be treated differently from those who have gone before and those who will follow. Some will have got higher grades than their abilities deserve while others, possibly as many as 280,000, will get grades lower than they and their teachers and schools expected / predicted.
Unfortunately there is no perfect solution to what is going on, and that makes them all crash-test dummies.
Those who got higher grades than their wildest dreams would have allowed will soon find that they are not up to the job. Unfortunately it will be after they have wasted months struggling at Uni and having taken on some form of student debt.
OTH many of those who were under marked will miss out, that's obvious, yet ironically some of those who could have expected B and Cs but only got Cs and Ds could find themselves in more suitable routes to employment such as (proper) apprenticeships.
What is clear, or should be, to the education establishment and students alike, is that the current system needs looking at to try to make it as fair as possible to all - and both sides have their part to play in that.