It just came to me, I think Smart is the strongest guard in the league.
I can't think of anyone else that compares to him in that regard.
Screen setters are well aware of him coming through. His reputation is already well established in that regard. Some are surprised, some are holding their ribs, DMC will get ejected for it.
He can also box out bigs. I have seen many times, most notably at the end of G1 vs Atlanta when he boxed-out Horford. On that play he also made a fairly accurate one-handed 60 foot heave with no time for preparation and inertia at all. Pure strenght. One number smaller MWP, during his Ron Artest days. Combined with his motor and guile - I love it.