Interesting, thanks for sharing.
Still largely irrelevant for the immediate purpose
Now, did he do anything post-grant basis that would cause revocation?
I'm not aware of anyone who's made that accusation. Minnesota statute requires prosecutors, in any case that would require revocation, to inform the issuing sheriff, and repeats the background check annually to catch any that were missed, so the window between action and revocation is fairly small.
Still, that he had a valid carry permit doesn't prove that he didn't do something stupid. I'm wondering who his instructor was, because dealing with a a police stop is something that should be covered.