Interesting thread here. Anyone can learn the notes. How to play them is where the difficulty lies - discovering what it is you want the music to say, and then discovering how you make it say it. This obviously requres listening to yourself critically and experimentation until you like what you hear. In my experience, when I focus on "technique," the net result suffers. But when I focus on what the music means to me, and how do I make it sound that way, somehow amazingly technique improves, and so does the end result. The fingers tend to follow the mind, not the other way around.
Back to the thread - in my humble opinion the real genious of the great performers is their capacity to understand the music, what it says, and how they want it to sound. Since you can't be in their mind, you can never make it sound the way they did. Also, recordings of the same music by the same "great" performer made at different performances yield music of completely different sound and meaning. Simply, the frame of reference, the ideas, the goals, had changed from one perforance to the next.
So forget trying to copy anyone - it's a waste of time, and it is dishonest to yourself and anyone who cares to listen.