Scraggly wing feathers?
It does sound like angel wing to me too. I haven't seen it myself but the airplane wings are a common description. If its had this going on for months it would be too late to treat it but, as I understand it, it won't bother the bird. You'll just have an airplane goose for its entire life. Perhaps someone else who has more info on angel wing disorder can comment and give tips here.
edited for spelling
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Angel wing can be either genetic or too much protien in the feed as the gosling is growing or both. In sebbies we feed high protien for the first 3 weeks of growing then slowly change the feed over to a lower protien feed. This is to help the wings from going into angel wing.
Yes, way too late to tape the wings....