Great question. I'm throwing in with Smart at 6'8" but don't sleep on Avery Bradley at 6'6" with his quickness, developing shot, and off-ball cutting he'd be pretty great.
That's actually an interesting point.
Bradley was listed at 6' 3.25" with a 6' 7.25" wingspan at the combine.
If you added 4" to his size he would be 6' 7.25" with a 6' 11.25" wingspan.
With size like that Bradley would likely spend most of his time at the Small Forward spot, where his ball handling and passing limitations would be far less an issue. With his lateral quickness, leaping ability, motor and general athleticism combined with his shooting ability...he'd be amazing.
You'd be looking at a hybrid of Demar Derozan and Jimmy Butler, pretty much. He'd be REALLY good.