Hopefully the vet check will tell you what you need to know.
What is it you want to do with the horse? If the vet says he's good to go, and if he's smooth riding, willing, and sane, then will the "catch" be significant?
Could it be you might be passing up a good horse in search of a perfect horse?
" He is beautiful and has many qualities I was looking for"
"My husband rode him, really liked him; I rode him and for the most part I really liked him too"
I hope you find the answer you seek.
For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.