Would I pick him for the next national finals rodeo horse? Nope.
Does he look that bad? Nope.
He does look a little "odd pieces put together" in that his long back makes his short neck look shorter, he's very slightly cow-hocked in back (very slightly) and a little splayed on his front legs. I would like to see more roundness and muscling on his hindquarters and hocks set a little lower to the ground. Shoulders are steep in comparison to this hindquarters. And also lose some weight and get in shape. He's got a belly in the last picture.
But he has a very nice soft face and soft eye. His girth is positioned well. And overall he looks "okay".
So as long as you give him proper conditioning, proper nutrition, and regular vet care to that his body can handle the stress of doing barrels, he'll probably be fine. It's mostly a matter of if his mind can handle the stress and if he has the heart to do it.
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.