Acemario, I posted on your thread, but here's my thoughts: I think 4, 5 and 6 are cockerels.
I couldn't get a good luck at 2 and 7's combs, so I couldn't guess on those.
Lisa, I am so, so sorry about your poor Japanese.
Poor baby
Syracuse Dan, I have never hatched duck eggs before. It's on my bucket list though- I think it'd be fun. What kind of incubator did you get? I think a good incubator is key. I'd get it up and running to make sure it holds temps. ON the other hand, you've already got the eggs, so you've got to get right on that. This page looks like it has some great advice. https://www.backyardchickens.com/a/incubating-and-hatching-muscovy-eggs
I couldn't get a good luck at 2 and 7's combs, so I couldn't guess on those.
Lisa, I am so, so sorry about your poor Japanese.

Syracuse Dan, I have never hatched duck eggs before. It's on my bucket list though- I think it'd be fun. What kind of incubator did you get? I think a good incubator is key. I'd get it up and running to make sure it holds temps. ON the other hand, you've already got the eggs, so you've got to get right on that. This page looks like it has some great advice. https://www.backyardchickens.com/a/incubating-and-hatching-muscovy-eggs