Sowell makes clear in a A Conflict of Visions: Ideological Origins of Political Struggles that inequality of current intelligence is a key part of the unconstrained vision:
It is only when estimating the potential intelligence of human beings that those with the unconstrained vision have a higher estimate than those with the constrained vision. When estimating the current intelligence of human beings, those with the unconstrained vision tend to estimate a lower mean and a greater variance. [pg. 147]
Here's where it gets bizarre: wasn't Larry Summers chased out of Harvard's top job for saying something like this to a bunch of holders of the unconstrained vision?