Economics does not work with specific comparisons for me, I.e. not in comparisons between this and that person. In your theoretical comparison, both are able to contribute given the proper opportunities, as a country you have the resources to give them both opportunities. The blocker as far as I can tell from an outsider’s perspective is that the society is conditioned against supporting each other.
I am myself a highly skilled immigrant (different country). It is convenient to be able to pick and choose, but this can end up in a kind of immigrant monoculture. I know of less skilled at the time of entry immigrants that have achieved more than me, by sheer passion and entrepreneurial spirit. Education is a good indicator but not the end all. Finally, this selection will work for first generation, what you get from the following generations is correlated perhaps, but not defined, and statistically as per my previous answer, the US got pretty good outcomes with minimal controls at the point of entry and with a pure aspirational system of values that self-selected success (big discussion now that we move on this and it’s relationship with generational poverty).