I highly doubt it. It's more likely your guy was scared off by something (a predator passing by for example) and was hiding someplace he felt safe. Birds find a nice place to roost at night and don't typically move around after dark. Once the sun came up, he returned home. Glad your guy came...
I have no experience with domestic male ducks sitting on eggs, but I can confirm that some wild species do share in the incubation duties. I used to be an Avian Keeper at a zoo and had several different male Whistling Ducks (Cuban, Spotted, etc) that would take turns with the females in...