You are cherry picking. Those guys can't touch Emmitt's stats in any other category. Plus, it's misleading as Emmitt scored more short yardage touchdowns than any running back in history which drags down his average.
From 1991 to 1995, the primes for both, Barry Sanders had a YPC of 4.8 while Emmitt's was 4.6 and that is with Emmitt scoring so many short yardage TDs.
From High School through college and the Pros no RB in history has more rushing yards and rushing TDs than Emmitt Smith.
In NFL history no RB has more carries, rushing yards, rushing TDs, 100 yard games, or a longer reign as all time rushing leader than Emmitt Smith.
In NFL Playoff history no RB has more carries, rushing yards, rushing TDs, 100 yard games, or a longer reign as all time playoff rushing leader than Emmitt Smith.