[HungryBear]

If they ranked above the Imperatives, wouldn't they be the Imperatives?

Not really, U have to know the difference.
Let me try an find an example:
Breathing is an essential
Walking the fairways is an imperative on the PGA tour.
The tour pro must be in good enough shape to have good and comfortable breathing or he/she will not be able to walk well.
The pro's must train himself to walk and play at a reasonable rate. If he can't he will loose strokes and have a poor round.
Not a great example but it will serve the point.

hb