The fourth for passing TDs (16) doesn't mean a thing, given the top two had 35 and 24 respectively, and Tyler Bray had 17, and played in not even half the games McCarron did. When the guy in first place throws over twice as many, and the guy in second place throws 50% more, it isn't really that impressive.
So, McCarron did good this year. But let's not delude ourselves into thinking his primary role was anything other than handing the ball off to stud running backs. There is nothing in the statistics that say if Murray or Bray had the running game McCarron did that they could have blown his numbers out of the water this year.
Also...Jarrett Lee, Jordan Jefferson, Maxwell Smith, and Clint Mosely all finished with less INTs.