Oh Rut, you just couldn't resist could you?
Incredible official: Good rule knowledge, good mechanics, good presence, good game management.
Great official: Good rule knowledge, good mechanics and great presence.
Good official: Good rule knowledge and good mechanics.
Fair official: Good rule knowledge.
Poor offical: Poor rule knowledge, great mechanics and great presence.
Horrible official: None of the above.
Obviously, I left out many possible combinations. But the point is that you could become a decent official without that "presence" that you so highly prize yet you aren't going to get past horrible without good rule knowledge.
Z