marcus smart all ready plays d with the intensity only youth can bring.His willingness to create contact,to fight over top ,his upper body strength even against the bigs .The quick hands and how he strips the ball. --NONE OF THAT CAN BE TAUGHT-he just has it.The whole NBA wants hin to succeed and he all ready is being allowed to play like no other rookie on defense.Marcus ,crowder and bradley will shake up some players,As he did with cousins but it is a long season to war at that intensity.Russelll did it ,bird did it and cowens did it ,havilck did it ,paul pierce kevin garnett and sometimes Rondo.