Above is actually a very perceptive statement. I agree he was tracking early in the same mold as a M. Stafford type. That said, he never has had a line worth anything and had to throw on the run a ton.
In 2014 we began to see massive improvement much like Stafford also showed in his year 3. In 2016 Luck also played very good even though he was playing with an injured shoulder. Now that he has had surgery and it appears he will be at full strength going forward with an improving team, I believe it is only a matter of time before he is considered the heir apparent to the best of the best.
Yards Per attempt is an important stat but then again Tom Brady and Drew Brees shows us the most important stat is real effectiveness within a system. Brees career YPA is 7.6 and Tom Brady's career Y/A is 7.5.