First, the good: he's pretty well-balanced through the body. He's at a gawky stage right now, but he's put together. He has a nice long tail.
and the bad: He has a classic AOAC head. When AOACs go "off" in the skull, it's usually in a very predictable way: they get very, very deep, and often also wide, in the backskull, with a round eye. He has a heavy skull with nonparallel planes and a rounded topskull - though he's certainly not the only AOAC with a head like that. I will tell you that his head will get heavier and more coarse with age. You can see the differences in the shot of the three of them in the bathtub - they have very different expressions. A "pet" AOAC tends to have a rather different look from a "pet" Sable. (Sorry, that head just stands out to me!)
In his body, I do see that his pasterns are very upright and he's a bit calf-kneed in the front (though that could change as he matures). His hocks are rather long and he lacks angulation in the rear. I can't tell what his tail is doing, but I'll take your word that the tailset is poor. I'd like his neck a little longer and his back a little shorter, but that's just going by the pictures. The pasterns are the part that I would watch, if you plan on doing sports with him.
whew, I feel kind of bad writing all that out... but you did ask! I hope this is OK. He's certainly lucky he ended up with you, and I know he's going to have a great life!