First three are crowwing roosters.. the big feathers on the wing are solid color(black in these)
Next two are duckwings, the first is a red duckwing, second a silver duckwing. The wing feathers have two colors that combine to make the triangular patch on wing.
It can seem insignificant but genetically it can be extremely important for some genetics. Example one major difference between lacing on wyandottes vs sebrights is because the former are on crowwing and the latter is on birchen. You can never get laced tails on duckwings, only solid colors.... someone trying to get lacing onto wyandotte tails are going to be very frustrated if they don't introduce birchen(a crowwing) into them first...
The chick down is also very different, the hens are also even more different in appearance.