I know the French have confused the Wheaten and BC roos in the past too, but I would think they wouldn't use such mixed blood birds in the photographs on their club website.
Don - Thanks for sharing about your work. Are you saying that none of your birds have ever thrown a wheaten? If that's the case, then the light shank and straw hackle seem unlikely to come from wheaten blood since you've hatched hundreds of birds without hatching a single wheaten. If the wheaten genes produce pale shanks and straw hackle, then you'd get at least a few wheaten chicks when you hatch.
Don - Thanks for sharing about your work. Are you saying that none of your birds have ever thrown a wheaten? If that's the case, then the light shank and straw hackle seem unlikely to come from wheaten blood since you've hatched hundreds of birds without hatching a single wheaten. If the wheaten genes produce pale shanks and straw hackle, then you'd get at least a few wheaten chicks when you hatch.