Please do not misinterpret this post of mine as in any way disparaging the benefit of cracking the Nazi Enigma machine. BUT
the Allies obtained blueprints for Enigma from a patent office.
Some accounts of Turing's contribution was that to operate Enigma correctly, the multiple selection levers on the machine had to be given non-zero settings.
The account I encountered reported that Turing tried the machine with all the selectors as base, or zero setting.
That account reported that this was the machine setting the Nazis initially used.
How the history unfolds from there, I'm not sure.
And Turing may indeed have been incandescently brilliant. But in this case a young teenager might have made the same discovery, out of curiosity or sloth.