In the latter case, the solution is racism. If the non racial signals are biased against group X, then, when used in the context of those other signals, members

In the latter case, the solution is racism. If the non racial signals are biased against group X, then, when used in the context of those other signals, membership in group X becomes a positive signal, regardless of its independent signal. I believe there was a time when the military did precisly this for black SAT (or simmilar) score, because they found the same score tender to be smarter when it was a black person.