YES! lol it is due to the second part, not the first. As far as I know there are no pattern genes (pinto-tobiano, frame, etc, or Appy or grey, roan) that will not work on all colors. There are some tendencies within those but I think it's apples and oranges when it comes to color/pattern. (Correct me if I'm wrong! I can't think of anything otherwise)
They definitely exist and are out there though they are not, in general, ideal for breeding stock. Buckskins are relatively dark (in general again) so while the pattern may not be as flashy it isn't as hidden as some of those horses up there. I think it's beautiful on a buckskin, but most people prefer dark obvious colors. It's just a matter of preference, while the pattern may not be as noticeable on a cremello you can still market "I have a cremello Appaloosa, no one else does, buy it!" though it maybe isn't as good a line, it really just comes down to personal preference, aside from marketability.
You mare had a 50% chance of getting the Appy gene and didn't, she could possibly still carry spots though as I said, but she won't ever show it.
Wild bays are basically the same as bays but the black is more restricted-
I see the confusion. Yes, all buckskins have black points, some (a good amount but not all) also have frosting (along the mane and tail), buckskins in particular are known for this, it's also more obvious on them than other colors I think (dark mane pale basecoat).
I think this is a good example, some have a little some have a lot.
From the Buckskin Horse Association ( :) )- A true coloured Buckskin should be the colour of golden, tanned deer hide with black points. Shades of Buckskin may vary from pale cream to light gold to dark gold to chocolate. Points (mane ,tail, legs) can be dark brown or black. Guard hairs grow off the body coat up over the base of the main and tail. The hairs are Buckskin coloured with frosting which is a collection of lighter hairs streaked through the mane and/or tail. A dorsal stripe may be present in the Buckskin but is not very wide or prominent.
(I will make note that the dorsal stripe mentioned is countershading and not a true dorsal as seen in a dun) The points don't change, the mane and tail just have the "frosted" guard hairs.
As with anything I think what you are seeing is just variation in the individual horses. I would think if the coloring was lightening them anyways at that point the horse would no longer be recognizable as a buckskin.
Your mare is gorgeous!! Remember, the color is separate from the breed. Some purebred Appaloosa's don't show color. Just like "breeding stock" Paints. She does not appear to have the leopard gene (I am using leopard interchangeably with Appaloosa so as not to confuse you, the name is the leopard gene, but confusing since that is also the name of one of the colors so Appaloosa gene makes more sense) in which case she will not roan. She may of gotten it but I don't think so (look up what the traits are other than color). So she is to all effects a solid horse. She MAY carry the patterns for spots so if you bred her to a horse with that gene the foal may have spots, but she also may not. So your mare is a solid, and beautiful, buckskin.
The horse needs to have that gene to roan (unless they have the regular roan gene of course).
I'll try to find it!
Good I'm glad :) Yes, it was clear. No, but I don't usually. I just check my CP.