I'm pretty sure I was at the true Scar Ridge summit on June 2, 2005. Your description agrees with what I found. Flat, fairly open, mossy. I remember a herd path running east-west, more or less. I've forgotten if it petered out heading east or if I just didn't bother following it once it went downhill. There could have been blowdown, too, who knows.
Here are some photos I took (as if there is a prayer of anyone saying that it looks familiar):
I found the AMC canister on the other, slightly lower, summit just about a year ago, so I consider the mountain climbed. Most people probably only go that far, anyway. There was definitely a herd path there. I picked it up as I came from the south and it curled around to the west and led me right to the canister. I don't recall how far it went beyond that point.
I climbed Loon back in May of this year. I didn't notice any path heading toward Black Mountain, but I didn't look, either; I was just interested that there was actually a path. I don't suppose I have much reason to go up and look for it at this point.