Thanks for the insight, but now I'm confused.... I thought that the SOP was something that was supposed to (in theory anyway) be achievable. So although the liklihood of one particular hen or cockerel having ALL the SOP traits in one package...it would more or less be possible in the live, existing, flesh-and-blood birds to have all the traits in various individuals.
Here's an example, we are working on the male to have a single comb, upright, a certain number of points etc. -- I may have such a bird -- with the perfect comb, but sadly all the other traits are sub-standard. ETA - hance agreement with your statement that 90% of birds don't meet SOP - but there should be yellow legs, white earlobes etc. throughout the breed somewhere or other....
Conversly, if no Cream Legbar cockerels anywhere on earth, now or in History had other than a floppy comb, should that trait (upright comb) get into the standard of perfection when there are no birds that have the trait. Wouldn't the SOP have to have some connection to the reality of the birds -- if you can picture the example I just wrote.
Springboard that concept to the light color feather shafts...if the larger portion of the birds have a visible feather shaft, both in the USA and in UK from what we can tell -- and the historic pictures are not close enough, and clear enough to be able to tell, wouldn't the alert that this is considered a mark-down on a bird provide the opportunity to correct the SOP? It escapes me why we would not mention it, in SOP -- if it is what the birds have.