There are plenty of "pre-green" horses out there that are quiet. Some warm bloods from Europe that have shown in jumpers get imported here and show in pre-greens! So no, not all pre-greens are wild. I think your problem is the trainer. Unfortunately trainers all have their types and other trainers they like to buy from. You will be hard pressed to find a BNT that will just let you go by a horse. Good luck. Hope you can find something. If you do buy this horse, do get a blood test. You never know!