Someone needs to provide a way of extracting the component of the downward slide due to the referendum result from the previously initiated correction cycle. Until that can be unambiguously constructed
further argument is futile.

You set too high a goak I think. Whether you are talking Brexit or any less critical financial analysis - profits from sales of Mr Kipling cakes for example - youu will never get a clear unambigous cause and effect like that - there are too many factors, the world is too interwovwn. But it is ppssible to get indicative measurements. It is a hard and subtle task