The previous owner must of had Dave Holderread bloodlines.
In the 3rd pic on page 1 the curly one in the foreground looks like a rare lavender and the tan and white smooth bird is a buff saddleback.
Lucky you to get some rare colors!
If I were you (if you breed them) breed the smooths to some curlies and you will get about 50% curly offspring from those breedings.
I have 2 articles on my website regarding Angel Wing.
I'm of no definate opinion as to what causes AW.
It's all too confusing due to the conflicting information
but I feel its most likely both feed & genetic related.
Over feeding and lack of grass and exercise is a big culprit.
Also some of what you're seeing in your geese is merely stiff primaries which is an undesirable but very common fault in Sebastopol Geese.
Sebastopols also commonly get a disorder called
"Twisted Wing Tip".
See details on the bottom of my sales page and on my colored Seb page regarding TWT.
There is also info on breeding smooth Sebbies on my colored Seb page.
Have fun with your new geese!