Yes, but I don't necessarily think I'm right about any of this. I just like to ask questions.
Those black heifers are all from the same cow family, the only Angus family I save from because they do so well, year in and year out, on this grass on this hill on this farm. I try to think local. Crossing these related animals that have been selected for functionality with a bull chosen for consistently transmitting moderate frame size, hardy constitution, increased depth, good disposition etc seems, to me, to be an attempt at improving performance under these conditions through recombination. Selection for the adaptive combinations is the breeders task.
Here is a 3 way cross from the same cow family a half sister out of a half sister of one of the black heifers.
All you say is true.