and thats why rooney is only a great striker, not world class
the best attackers don't track back much because then they wont be able to counter attack which is one of the easiest ways to get goals, just a quick look at Zlatan, Ronaldo, Messi, Aguero, Lewandowski, Robben, Suarez (he does do defending, but mostly through pressure)
Rooney belongs to that small category of gifted strikers who defend too much for their own good, which includes Cavani and Tevez