Well, if that's what it is, it doesnt look that bad. So depending on the severity of it, he could work as well as any normal horse. Id make sure his saddle and pad are very specific to his needs, so that may be difficult.
He's young and still growing. It could get better, worse or no different as he matures and develops. I'd have him assessed by a vet before doing any backing with him though. Just to be safe.
I've seen way way worse and the horses work well. Just depends on the horse.
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