I'm sure that the only way to analyse a race 'correctly' to decide the genuine top rater in a race, is after it has been run. If it was so easy, we would all have recognised and backed the winner of the C/Cup which was the correct top rater and at massive overlay odds.

Personally I've never seen any publicly available ratings that produce a long term profit and correctly recognising 'overlays' is a subjective guess, not a science that only requires correct computing.