Call me naive, but I don't think Newey's genius can be "taught" to someone else.
Nobody can define what genius is, so it is impossible to copy one.
But, Newey has methods based on his knowledge, which is documentable, his logic, which one could learn, his reasoning, which someone close to him can understand, his analysis, which could be told by himself, his inspiration, which is greatly based on all of these could be told to someone else. If you ask me if this could be mastered by one single person, I say perhaps not. Also, it is not necessary that there is a copy on Newey. I think it is much more exciting to find someone who does differently, but could communicate with Newey in a very instinctive level as well as very logical levels.
I think everything about car design is written in the book of nature. It is up to a designer to find relevant inspiration to connect the dots.