True, but skill is a factor in being the best, its different than being the greatest.
For example, there are many better drummers than Moon, but probably none greater.
I dont think putting on a good show is part of being the best, its a merely subjective thing, being the best at anything is something i always like to objectify, and i think putting on a great show dosent make you the best, plus being very charasmatic live dosent really factor in the music...Thats just me though, but i think theres a difference between musicians and performers, some people can be good performers but sh*tty musicians (even as someone who likes Motley Crue, you should know where im going here

) and some can be good musicians but bad performers, many of these virtuoso type guitarists are on stage just standing there, either faking their facial expressions (very unconvincingly) or make none at all.
Im not slagging Moon, who probably is my favorite Drummer (either him or Bonham or Grohl) its just that in technical terms, there are many who rise above him in the ability level.