I agree with Shoebox- while you didn't accomplish what you were planning on, just getting him to go in and out of the stall properly is huge. Especially huge given what you've told us of his personality and responses. So while it wasn't your plan, sometimes you have to be flexible, and you still got a 'win' in. Keep at it. Keep pushing him and being consistent and I bet he will finally decide to give it. Once you get that, he will have a chance to learn how much easier life is if he lets you be in charge and you'll be on the way to the right path.
I hope you will keep updating us on him- I am always interested in these tough cases. Do you think horses like this ever become relaxed enough to be handled by 'average' competent horse people, or will he always need a very skilled handler? Or can you even venture a guess at this point?
My honest opinion is that people who keep stallions should know how to manage stallions. I have three intact boys on my farm . I can walk them all around mares in season WITHOUT chains. They are WELL BEHAVED! HOWEVER... they don't naturally act like gentleman. They constantly need reminded of their brains and you cannot ever let your guard down around a stallion because they think with one thing only!
This particular horse has had three long years of being spoiled and allowed to get his way. Im guessing the owners think its cute when they give him treats and reward train him.. and than one day he was big.. and thinking with his you know what. They tried to get him to do one thing.. and he wanted to do another. Reared.. lunged... struck... and learned he got away with it. Fast forward to today. He is a 1000 lb animal and KNOWS IT.
I think these are the WORST kind of horses and the most dangerous kind. Owners spend years nursing these problems and expect trainers to work miracles with them.
Do I think this horse can be made to respect humans. YES.
Do I think that without reform from his owners though will he go right back to his old ways? YES!
I can go leaps and bounds with a horse.. but if the owner does not change the issues that brought that horse to this point... they will go directly back to what they know. This horse since he was allowed to get to this point will probably always need to be reminded who is boss.
He is with me for 60 days for "saddle breaking" but I swear I can never get a horse in that JUST needs saddle breaking.. they are always terrors! LOL