Ha! So many of my favorite folks (except for that bikerchic ).
Very interesting observations, and thank you all for participating in this discussion...if I wasn't so tired from eating sawdust all day, I'd respond one-to-one. However, perhaps it would be of value if I offered a little bit of "narrowing" here.
As a not purely hypothetical situation, imagine two JWs, both (to all intents and purposes) equally educated and capable of performing all of the analytical processes 'ordinarily' associated with intelligence.
After a period of time, one of them synthesizes the evidence, and "sees" through the WTS bullshit. After an equal period of time, the other one still does not, and becomes even more entrenched in self-denial.
Is it a matter of one of those JWs having a more developed emotional construct? More self-courage? Or, perhaps (as I have speculated with others, and still wonder)...perhaps it's "just" a matter of intuition?
"Intelligence" is a very slippery little critter.