Yes Matts thesis is well written and well presented but it is unwise to say it is conclusive until someone else who disputes the findings submitts a similar submission and that could be a long time away.

My own view is that this topic is too out of date to be sensibly discussed. There will be claim and counter claim on both sides. This is like trying to prove that Richard 111 was responsible for ordering the death of the two Prices in the Tower of London.

Sometimes you just have to accept the fact that there are somethings can will never be truly answered.