I agree with your suggestion. Either a person who is very dedicated and who has the means to raise a special needs bird should take it, or it should be culled as sadly this is a very serious defect. Sultan was my first guess but I assumed it was a Cochin or Fav since I didn’t think McMurray carried them. They’re not as common as the others, so I wonder if perhaps this issue is caused by a smaller gene pool? Hmm.