I'm definitely no expert since this is my 1st year as duck Momma. I have all drake flock, 6 Muscovy's born maybe in June. Some of them starting picking on the smallest/youngest one pretty bad. Then he learned he could fly so started flying away from them but unfortunately he'd fly out of my yard into the pasture across busy road & where coyotes hang out. I think one drake took pity on him and befriended him trying to help keep him safe and keep him company. But he would sometimes fly after the picked on drake. And sometimes the bullies would fly after him. So I ended up having to clip all their wings.
The 2 BFF's usually hung out by themselves to avoid the others and the other 4 hung out together in different spots. But sometimes he'd still get bullied so he'd run as fast as he could to get away. Kinda funny watching him use his wings to push off the ground trying to run faster.
I guess he got tired of getting picked on so he tried to take down one of the bullies. He lost that fight. He tried again & held his own, didn't quite win because he was being double teamed, maybe it was a draw. lol After that it seemed 4 of the other drakes had new respect for him & let him back into the flock and kicked out the other 1 that might have doing most of the bullying.
One of the other drakes befriended him. So now the 2 brown drakes hang out together, usually. One brown drake is allowed in the flock but spends most of his time with the kicked out drake. Those 2 have tried to double team the bullied drake but his BFF and sometimes one of the others comes to aid him.
Yet sometimes they still all forage & nap together. And sometimes the bullied drakes BFF gets mad at him, usually when it comes to sharing water. He has no problem sharing food but not the water.
So right now it's mostly peaceful.... but don't know how long that will last. It's still hard for the bullied drake to get any time in the pool without someone kicking him out.
I just tried to let them work it out but not sure if that will work for you or not. Just sharing my limited experience.