Grey here are our adult pair
Gander left, goose right
Gander in front of the goose
Gander left, goose right

Gander in front of the goose

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It shouldn't be a problem at all. Even in the wild, Konrad Lorenz often observed ganders forming pairs. They could still occasionally mate with non-paired females, but they preferred each other's company. Problems with ganders fighting generally only occur when a female is introduced.What if we end up with 2 males? Will that create a problem later on?
Grey, that would be the belly button. Sometimes they are more pronounced shortly after hatching and they quickly get covered by down and then feathers.
Couldn't see the image, but would bet money that is what you saw.