Another plot hole?
Now don't get me wrong... this is one of my favorite movies of all time.
I love Kurosawa's work, and even tried (in vain) to learn japanese. ;-)
BUT
In the end, Matsoumoto ONCE AGAIN defies orders from his superior. He is even suspended, yet he still helps out Nick again.
Japanese culture strongly stresses the honor of following orders, working for the collective, etc...
So wouldn't the Osaka police gladly taken Sato in custody, but still punished Matsoumoto for acting ilegally?
Yeah, I know, it's just a movie...