The GFF website states "This breed is very large -roosters can weigh over 10 lb." and then their auction listing says "This ultra-rare breed is very large -roosters can weigh over 12 lb."
I get how that, on top of the 8 kg UK weights is sketchy as all get out. I have noted this in the past in my notes, and I have tried to rationalize it in my mind instead of contacting GFF since they are so busy.
If you can't get through their phone line their email turn around time has always been pretty quick for me (but not 2 hours quick). I don't own any Bielefelders yet, and I'm not invested in defending the breed. I am invested in figuring out what the real question is when a vague one is posted. I told you what I suspected was a likely cause of such a staggering difference in recorded weights, but apparently that wasn't what you wanted to hear, so you ignored it and inferred that I was making a negative comment on German chicken husbandry. Given the urgency of your situation, I suppose your reiteration of your concern makes sense as a symptom of that instead of what I read as a person just trying to stir up trouble where there wasn't any.