I think it is the start of it but I would wait another couple of days just to be sure. Since Io is so young it should only take 2-3 days of being wrapped. One of my developed angle wing around that age and I think I only wrapped her 2 days. I found it easier to wrap both wings and used vet wrap. Don't go too looser or too tight.
Thank you! Looking through it now... I guess it pays to play with your ducklings every night, lol... at least we caught it early...
So consensus is angel wing?