Oh my - me too!! My yard and pond look like we had an early snow!My duck pool looks like one of my ducks was plucked and eaten right now. Both of my two year old drakes are molting their wing feathers so there are large feathers floating on the water. One of my drakes is ahead of the other. So, I suspect that is what you have as well. Certainly it wouldn’t hurt to watch him for bullying or disease but I bet he’s just ahead on molting.