Okay, here goes: I didn’t read what everyone else said, so I may be repeating things or you may have already heard what you wanted to hear, but:
6409: I like the angle of his shoulder and hip. I still think the way his back ties into his croup is not ideal. His back is really short and his loin is longer-- it’s a little deceptive, but he looks like he might be a nightmare to saddle fit. Also, his legs aren’t straight. Again, it’s hard to see when they’re in the teeny tiny pens and can’t move out, but he looks really close behind and maybe toed out.
5815: This is one of the better Sand Wash Basin horses I’ve seen. I like how he steps under himself and even though his back is long he is naturally “over the back” and relatively well-muscled especially for 16. The front end is where he loses me. His shoulder is too small for his body (remember the splitting in perfect thirds I was talking about) and his head is low enough and his back long enough for me to be concerned about how he would handle any degree of collection. He might just drop out from under you.
8459: Small hind end, weak hip, long back. He’s really tucked up at the waist and something about his right hind looks off to me. Slow this video down and look at how his back bounces up and down like a suspension bridge at the trot. He’s also got a small shoulder, thick neck, and an unattractive head. I’d pass on this one.
8403: I like this guy. I think at 3 he would mature into something nice. I like the angle of his hip and he has the best back of any I’ve seen so far I think. I also like his bone and his shoulder. I don’t love how his neck comes out of his shoulder (too low, comes out of the middle of his chest and not from the top of his wither) but he uses it well despite this:
8405: His shoulder and hip don’t match and his neck ties in too low in the shoulder. I don’t like how he gets all “stretched out” at the trot. He would look better relaxed but with the combination of the smaller hip, big shoulder and his neck tying in low, he will be difficult to get off the forehand. You really have to watch them move. The pictures of them in the pens are deceiving, conformation-wise.
8410: This horse is very similar to 8405, except the problems are less extreme all around. His hip/shoulder are more even and his neck is much nicer. But, his left hind is sticky. At a couple of points in the video (around 20 seconds is the obvious one) it kind of bows out underneath him, and he seems touchy on it. He favors spinning left so he can weight/push off with the right hind.
5995: This guy looks a bit boring and his back is downhill, but the rest of him is put together nicely. I like that he’s interested in the camera and is licking and chewing. I think he’s toed out behind but not to the same degree as some of the others. His left fore also swings out at the trot. His neck is deceptive. It ties in a little low but he carries his front end nicely and his neck grows about a foot when he stretches down. A lot of the mustangs are too short in the neck, so I like that this guy has some length of neck.
6845: I’m fine with his back and hip, but his shoulder is small and his neck is too low. The fact that he is not relaxed only emphasizes that he is downhill and choppy in front, but relaxation won’t fix the problem completely. From his muscling it looks like he might spend a lot of time stressed like he is in the video. I might pass on this guy from that alone.
8403 and 5995 are my picks of the litter. I think it’s hard to fault them completely for little abnormalities in gait because they are not riding fit and I don’t know the quality of the trim they have now. I wouldn’t scrap a horse for a slight paddle in front, but unevenness behind is a no-no.