I knew people would take this the wrong way. Will Lee, I respect. The topic of the thread is "You know why Will Lee is great?" OP said it was because he plays exactly like the record. That is one reason Will has a good career, but that is not at all why he is a great musician. Putting spunk in commercial music IS a reason he's great. But that's not what the thread's about.
Scribes served an important function, and provided value to society. Certainly. The artistic respect I would give them, is a tiny tiny tiny fraction of that of the actual writer. Now that we have printing presses, a scribe is even less relevant. Similarly, if a cover-band bassist plays a bassline just like the record, well bully for him. It's nothing a machine couldn't do. (I'm thinking of a record-playing machine, not some MIDI contraption).
I'm not saying covers are bad, that only original music should be played. Interpreting music is something that can be done extremely interestingly. Bill Evans played nursery rhymes and was interesting. If I transcribed that note-for-note, and played it with all Bill Evans's expression, that wouldn't serve a lot of purpose, except maybe to my own development. As far as something to listen to, nobody would care, even if I actually pulled it off perfectly.