I'm not a fan of meaningless, revisionist, "if dog, rabbit" history.
I have my own unusual theory [just a theory, no proof] I bet you've never heard this one.
The real Hitler died in the July 20, 1944 assassination/coup bombing, it was covered up
and a look-a-like was used thereafter. At any rate, the Normandy invasion in June and
the assassination "attempt" a month later was the beginning of the end of Germany.
.