It seems like you are already falling for him... but be aware that that leg is going to really limit what you can do with him, and while that may be fine for now, what about in a year or two as you grow... you have a horse that can't grow with you.
I have lost a really great gelding to ringbone and arthritis... after 12 really good years. It's heartbreaking, unbelievably expensive, and makes them unable to sell even if you really, really need to.
Please really consider if you want to devote your time and money to an unsound, green, and somewhat broncy horse when there are many very sound, healthy, and sane horses out there also facing an uncertain future.
He is very cute, so if you decide to keep him, I wish you the best...
There is no passion to be found playing small - in settling for a life that is less than the one you are capable of living. - Nelson Mandela