Well, I am certainly not a condo guru, but, have been around my share of reining trainers…and have heard some of what they look for. One looks for a, inverted trapezoid shape, meaning the feet are up under the horse. another looks for slight cow hocks, which it looks like your guy has. That said, I do not know where you are, but can say from experience that there are few really low level reining shows around where I am on the east coast US. I have a grade horse that I put 8 months of reining training on. He can go do greens and look respectable, but will never win. He is not build unlike your guy. I too, just did it to have fun. If you have the $$ that is great. Don;t get me wrong, I love my horse for many reasons, but, if I really wanted to do more than say one show a year-I am wishing I had something else. Fortunately I like to do other things too.