The bird is too far gone. I think it is suffering I would cull. You are not doing your flock any favours by prolonging it's life. If it is viral you are putting your flock at risk. If it is genetic you do not want the genes passed on. If you let it remain in your flock it will be bullied and picked and have no life quality.help!
That is what I would do in this situation and reasons why.
Definitely keep it in isolation regardless what you decide.
Maybe some one else with more insight has an alternative.
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