A judge friend of mine said he would explain it at the show I am helping out at this weekend. I'll let you know his tips. He said that weak wing is a lot more common, and that a lot of silkie lines need improvement with the wings. He's been breeding silkies for 30 years now. Has the best in Canada.X2 it's a book of every bird that is recognized in the US with the call outs that list exactly what the bird should look like both in male and female. Tells you everything from size and weight of the bird, to accepted colors, feet, wings, eye color, type of comb, on and on... It is pretty specific.
He judges all over North America, so I'm sure he's seen his fair share of it.
Really, this needs to get nailed down! This really bothers me! But if that is the case, should it be culled anyway in favor of a better wing-- but what if that bird has better type over the bird with a better wing...? This could go on and on... I find myself outside pulling out wings and obsessing over them. I have a couple other birds to take pictures of-- I found something else interesting the other day.

