The disparity is fairly easy to explain, Dupuy table is looking at divisional losses, so including the infantry elements. At Goodwood, the Armoured Div lorried brigades were by and large, stuck n the rear. The poor old US armored infantry had ten months of dying to do.
He presented it that way due to the curious way he calculates projected armour and artillery losses in his QJM combat model.
When I’m not on my phone, I’ll chip in a bit more, hopefully before John tears into me:)
"Mistakes in the initial deployment cannot be rectified" - Helmuth von Moltke