Some one who wanted in 1943 to reconstitute Panzer Divisions with 400 tanks was a fool .The Soviets had in 1941 a big number of tank divisions with between 200 and 400 tanks and these fell immediately apart : divisions with 400 tanks can not operate .I don't know much about armor (or much of anything else) but this is the first time I've read of Guderian being called a fool.