Batsmen can get series or years like that.Difference with Dravid in 2002 is that he didn't put 12 runs on his average like Kohli or Smith, because it wasn't that abnormal for him to have a series like that. In these two cases, absolutely abnormal. Smith has almost scored 40% his total runs in this series alone.
What do you think scoring 4 double centuries in a year did to Clarke's average?