There are things about this game that can't be shown by stats or skill levels on weapons/magic.

Common knowledge is absolutly needed in this game for small parties to work.

That WAR with GA skill of 360 could still be whacking on mobs that the BLM have slept and are soloing.

That BLM with Enfeebling skill of 340 could still not have Sleepga/Sleepga II. How effective are they at sleeping large groups?

That NIN/WAR with Kannagi might not know what "Provoke" is.

Stats are only half of the battle. Knowledge can make a gimp player shine and a great player top tier.