You have the perfect case study of the difference between a horse handled correctly from birth and a horse that has not had that privilege. Calypso has come so far with you and I have no doubt she will continue to progress, but she will never know the security and confidence that Quest does. From the get-go, he has learned that he can trust humans to treat him fairly, to listen to him, to respond to his needs, to feed him and keep him safe. He's learned too that humans have boundaries, that he must behave a certain way, that there are things humans want to do that are puzzling but that he must allow it (and he does because he trusts them). He is a well-rounded, solidly confident, secure and happy horse, which is how it ought to be. He's loved but not spoiled, trained but not treated unfairly, corrected but not harmed. Compare that with poor Calypso, who came to you having no idea what to expect because she had obviously not been given that kind of care and fairness. Quest is a Good Boy partly because it's his nature but hugely because he has been given no reason not to be and has been properly handled from birth. And once again, you're doing the right thing for him even though it's hard for you. Much respect.