Don J. Modesto
I don't think I've ever seen a Honbu SHIHAN with such a slovenly presence. His technique didn't look very precise to me. His pins were arresting (er, to watch, that is; no pun intended)--much different from the canon. I agree that his doing them at the speed he did without injury is a testament to some degree of control.
I can certainly understand your points, but check out the throw at 1:00. The moment uke lands (even a bit before), Arikawa has Uke's arm extended and his free hand placed on a pressure point on uke's face, effecting a stretch/pin on uke. To me, that shows that he he knows what he's doing and why. He repeats this kind of technique a number of times. Niall Matthews has previously written about Arikawa Sensei's knowledge of anatomical points, and this demo highlights a lot of that IMO.