He's going to be able to lead the offense when Rondo sits and he'll be able to fit in as a 2 or combo anytime. The kid could play LB for the Patriots. He's diesel. He's not going to be shy about driving to the rim.
Rondo, for example, goes to the hole a lot in big games when it counts, but he's too slight and avoids the punishment on a night to night basis. Smart is going to be able to handle that contact and force the action night after night. He's going to be able to impose his will (and strength) on people unlike an other guard we've had in recent memory.
This could be fun.