Video didn't load for me but I couldn't watch it anyway. I did see a video of a hawk attacking a goose too, so it's not impossible for it to happen.
Oh yeah you have ducks. The divider should work on them as well but I just bought ducks after a long hiatus so I don't remember how well they...
One thing I thought about is...geese are large and a hawk will think twice before attacking them...a mini goose might not intimidate a hawk at all. People fear geese for good reason. :)
I don't think you need separate coops ...since a regular sized goose can't hop around like a chicken, all...
My goose originally had a sister who died at 10 yrs of age. She is now 14. My goose is fine with just my chickens. In fact, my goose loved my goats a LOT, and followed them around.
I did just buy some ducks but not sure how that will go over, with her having to share her bucket of water and...