The skin looks good when they´re in the roasting tray.
That would be great. Time will tell......2 points to you if it´s lavender.
I have a young gander here that was one of the first to hatch (the singleton that was on his own for a while), he is the size of the females, but slightly longer legs, has a slim face, not muscular, but is definitely a gander. His 3 brothers (subsequent hatch) all much bigger than him. He and his brother have now formed a mini-gang down there to protect on of their sisters who´s sitting on the tiniest egg! Teenagers!
The voice and the behaviour are the sure things to go by.