Great insight from atpollard , to which I might add a couple of more "back of the envelope" calculations, in hopes of muddying the waters.
12% of the population will satisfy the GROUP 2 – ‘OFFICER MATERIAL’ (Int 8+ and Edu 9+); if we make a useful (but probably irrational !

) assumption that naval recruits will match the population from which they are drawn, then 12% of recruits are in this category. That would mean that (VERY) roughly 6% of your naval personnel will have some pilot skill.*
So the initial numbers that jawillroy came up with may have been a bit low, but not all that skewed at least as far as the pilot skill is concerned.
In the alternative, if we assume that those with the GROUP 2 characteristics will self-select for naval service, maybe at a 3 times higher rate than the population as a whole, then the percentages go up by roughly that same factor of 3.
This higher incidence of pilot skill highlights how LBB2 and LBB1 fit together. Smaller ships requiring a higher percentage of pilots in the fleet. You don't spend all the money (and recruits!) on training pilots you don't need.
(This is a SWAG based on an "average" seniority of two completed terms of service in the fleet. Really, without knowing what percentage TRY to reenlist, no amount of calculation will tell you the actual demographics. But there will be a certain amount of attrition, arguably higher among those with Pilot-2+.)