I saw it.
I've also seen JBA practice. I'm basing my opinion on his ability to move his feet on the latter, not the former. He isn't a bad athlete -- at all -- he just isn't explosive like some of our bigs. His lateral mobility isn't impressive, although admittedly some of that might be attributable to him having to think and react slowly to his zone responsibilities.
He could be a "big" PF considering his shooting range -- but there's more to the game that just shooting [which is why Lydon, for example, was a bad fit as a 3 despite having great touch from three]. But I think he's probably a better fit manning the pivot in our system based upon seeing him in practice.