Yes, I do believe that there is an "it" of cognitive functioning/capacity that, ideally, is what is intended by the term "IQ" and that tests of it are mostly imperfect and measure proxies of that quality. Flynn and I may well disagree on that point.
I certainly think that it is possible to attenuate genetic potential there. I'm just not so sure that there are clear means of enhancing it notably.
I think you are describing different types of intellectual modes with basically fixed intellectual trajectories through life.
By looking at the early years, we're completely missing what happens in the actual adulthood of theses people with respect to productive capacity.
There isn't enough work on this subject to move beyond general theories.
