Looks like a chocolate ancona and a blue mixed breed. But unless you know parents, you can't consider them to be pure as mixed breeds can come out spotted like anconas. But that doesn't make them true ancona ducks
Getting him some muscovy buddies may help, but aggression is not a behavior you can just stop. It also tends to be genetic so I would NOT recommend breeding him.
When they are moved it does cause stress. So if they were laying eggs, you may see a break in production. But it doesn't make them stop laying for good!
It is possible but not common for anconas to be marked that way.
Unless you know the parents and the parents are pure anconas, you should consider them mixed breeds