NTAC,
There are a few problems with your theory. As others in the know have stated, the Army CWO program and Navy program are not alike.
So here goes your theory on longevity in the cockpit. All the CWO pilots in the navy will have prior enlisted time so they may chose to leave the service at the 20 year mark.
On the Army side we have a pretty high turn over rate for that very reason. You only get about ten years out of an E-6 who goes warrant. Of the 15 warrant officer pilots from my class I only saw three on the CW4 list. Most had left the service at the 20 year mark. Of the three, two had no prior enlisted time. The other guy was only enlisted for about 2 years.
I think you might be just a little over your head here. Also, being compared to the Sketerman is not a good thing.