mutz,
In this fascinating article the casualty estimates are confirmed along with an illuminating discussion on the hindrances faced by the proposed allied invasion. JP, you will find enjoy this immensely.
Fascinating!
And remember, this deals only with the invasion from the south by MacArthur.
The 10th Mountain Division were in the Aleutians poised to invade through Hokkaido, and their potential casualties are never mentioned in the article. These veterans of Monte Cassino and the Apennines would also have incurred massive numbers of dead and wounded on their way south to meet MacArthur's troops.
