He COULD be a WP horse, but he'd need a lot of refining. You'd have to pick what you'd like to do most--barrels or WP--because 99% of horses cannot do both (and if they do, they do neither of them well). They condition different muscles and as TOTALLY different things.
If you do want to do WP though, push him out and ask for more trot and more canter. He can't carry himself at the pace you were asking, and that's why he looked so scrambled. Once he learns to carry himself with impulsion and real collection, THEN you can ask him to go slow.