I hadn't even considered that, Doc! Nice.
Also, that model doesn't easily accommodate the "sleeping ancient evil" menace so common in literature and game worlds, unless they exist outside the normal divinity structure for a plane.
So, the short version is that I view those numbers to mean that, if the god is known, a deity of X power level is likely to draw that number of worshipers, roughly. The numbers are the effect, not the cause, in other words.
But that's just my interpretation.