A few years back I had 2 sections next to each other 16 sprints cocks one section and 8 distance cocks in the other. Treated EXACTLY the same. Let out together fed the same, identical.
Up to 250 miles I had nearly all the sprint pigeons home first winning the fed 5 times over 300 miles the distance cocks came winning many scottish positions. So I believe its all in the breeding and not the system - for my birds/system anyway!!