From the front the neck looks almost ewed. The throat latch may be fine but there is no strength in that neck. Does not go into the chest in a strong manner and if he fights the bit it is because in part because of the way he is built.
Because he has that type of shoulder that many TBs have ( I call them camel humps) he basically loses the connection from front to back. You will see the nice connections when the point of the shoulder flows smoothly and deeply into the back. When the front/rear connection is "stopped" by this type of shoulder the rider needs to work harder to make the horse connect to the rear. The shoulder does not have the steeper angle I would like but isn't too bad.
Has a reasonably strong loin connection but needs a lot more work to get the second thigh more muscled.
He looks a bit toed out on the left front and it looks to stem from farther up the leg so that could cause an irregularity in gait. Some overcome this, others don't. Pasterns are too straight for my tastes and again may affect the smoothness of the gait. I do see what Anebel sees in the over the knee but it seems to be on that same left leg.