I'd be more inclined to separate somehow, just until you can see how he reacts to the new 'lings... some drakes are indifferent, some are good fathers, but some will go homicidal... that happened last month to a bonded mallard pair a girl had... as soon as the 'lings started hatching, he grabbed them by their necks and threw them in the pool... some drowned before she figured out what was going on... hate for that to happen to you, she thought they'd be fine cuz he was so bonded to her and guarded her, but never know til you can watch them... and I'd guess it was a coon too, but I wouldn't rule out the possibility of him stealing that egg and trying to get rid of them... he might be frustrated that she is not 'with' him... just a thought...