Fly, there are various reasons why horses are free.
I got this boy for free. Of course, he was just off the track so I spent $$$ getting him retrained, but other than that, he's a lovely sane, sound, calm horse.
My grey was free, but she also came with tons of bad habits, had stood for a year, and has a weird front leg. She's fine for trails & lite work, but wouldn't be good at much else.
OP-Are his issues just conformation or is there something else going on? Will you be able to use him for what you want to do?