What an average of 99.94 means is every time he went to play he scored an average ~100 runs. Which is just too remarkable. And that too in test cricket.

Test cricket is just what it is, its a test of patience and concentration. You are supposed to play unreasonably long amounts of time(the whole day) in scorching heat. There fore to go in and play that, it just means one thing. Not only where his batting skills top notch in the history of the game, his ability to focus, concentrate has not been matched ever since. Please note bowlers are always on the look out to get your out. And there are literally many way in which you can get out.

This isn't just sport. This is meditation.