Nobody here has seen the OP handling this horse, yet on their word people are recommending PTS (an 8YO with potential) yet at the same time getting suspicious about the reasons for the thread.
So make your minds up. Either the OP is truthful, the horse is dangerous and the thread is genuine.
Or some of it's not true.
And why is it taken for granted that the bits that are true are the bits that damn the horse?
If the OP is honest about the horse in any advert, the horse deserves a chance to find an owner who is willing to take him on.
Better advice would be to post ways the OP can keep tabs on the horse after he is sold.
Once sold everything you wish for that animal is gone no matter how many things you put in a sale contarct it isnt worth the paper it is written on. So once it leaves your hands you have no jurisdiction on what happens to it so no I dont think it should be sold on I dont think it should be PTS yet either as the op isnt intending to sell but if they cant keep it for ever then its next place should be pts unless of course it seriously changes it attitude and becomes a better person to deal with. Horses have no concept of potential so all it needs is a caring home with good food and its welfare needs met.
I had a look at project horses for my pony thinking it may be a suitable site to sell him or gift him to someone who may want a driving pony but the project on there seem to be unbroken ones without problems so perhaps it isnt the site for naughty equines
I had a horse like this a few years ago and could no longer keep him, not only was he difficult he had ongoing soundness and health issues and was late teens . I made the necessary arrangements to have him put to sleep. At the 11th hour I had a phone call offering him a home with a friend. I was very dubious about her abilities to cope with his needs at first and wanted to be sure she knew what she was taking on . In the end I drew up a contract of sale and off he went for £1.00. I can visit as often as I like and she has given him a fantastic home, he's completely retired now but he's had a lovely time with her.He hasn't really changed but he lives the life of reilly so I'm really glad I didn't just wrongly assume that no one else could cope with him.
I have a horse much the same and at 17hh its no joke when hes rearing at people or if he decides to do one of his other tricks.
Yes he would have to be described as dangerous. Not with me I don't get what people do to him to get the bad behaviour. (and belive me hes been bad worse than yours sounds)
He's saving grace is he loves work (and rarely trys anything on with me) I've re backed him this year and after seeing how good he was with someone else on him I got on him my self (I lost the use of a hand last year, can't hold a rein properly etc)
There's threads on here where I've had total slayings for even owning him *sticks 2fingers up at many*
Anyway after bying my lad back off someone that really did get the worse out of said horse I spoke to a few professionals who felt that his ground issues would not be a problem as he had the looks etc for what they required and they expect comp horses to be a bit quirky
Said horse hasn't been sold now and I thoroughly enjoy hearing that he likes to try and tap dance on my yo head ( who has no reason to keep doing anything with my bloody horse)
He is a perfect horse amazing ride trys his very best to learn and get it right. Like you I don't get the same problems as much as everyone else because I don't panic shout or yank or smack him to come down. I just ignore him it works for us. And I know which buttons not to press to start the panic. I did the smack and the yank when I first got him hence the reason I got hurt lesson learnt. Im not the most experienced person in the world and have learnt a lot from him but no novice or would I let them ever handle him.
Cant believe as usual some people start talking about PTS. Thing is, horses are often different with different people. I'm not saying your horse would be better behaved with someone else but they could be! You dont have to be doing anything wrong, just horses respond differently. I had a big Welsh Cob, he tested the hell out of me to begin with - was horrific to lead and would go nuts in a trailer etc. After a LOT of work, he became so much better, you still had to respect him and watch everything he did but he was absolutely fine. On selling him, I knew he'd test a new person so I explained what I thought he'd do and sold him under the pretence that if she didnt get on with him he could come back and I'd refund in full. He was sent back within 4 days... apparently he'd been horrific to her - he'd bitten her, pinned her up against a wall, snapped 2 headcollars, galloped off. She basically hadn't even been able to get him tacked up! He was never this bad with me but I guess he just didnt suit her. I took him back. Then a 14yr old girl turned up with her dad. I explained everything to them and only allowed him on trial - they got on brilliantly and she still has him and is out doing pony club etc.
What Im trying to say is, please dont ever listen to people saying to put a horse to sleep. There ARE homes out there who would take a horse on like yours and be perfectly happy, it just depends what people will accept.