Yeah, I agree. Jack is a darker character, his role in the show is different, and that different approach is appropriate.

Still, even in the earlier seasons of MacGyver, it seems to me that what we get more often is the slightly diffident smile that seems to be a staple of the man himself, and the broad full-on grin of laughter, but not this one, which is somewhat between the other two, and probably rarer overall. But this may be the effect of still photography, catching an inbetween instant too...

And now that I've overtalked that one, off to today's 3rd and 4th grade soccer game!