I think your logic is flawed. It seems like you're implying that Miles was handed this talent. He went out and got it. Miles gets the credit, or blame, for the overall performance of our program. Ten years into his tenure I'll say he's done well - not great, but very good. I also see his performance improving. Recruiting is getting stronger, and his coaching staff is getting better.
The story of Miles' last few years has been one of greatness, but with one missing piece - the offensive coordinator before 2013, the QB in 2011, the defensive tackles in 2013. But that's the difference between great coaches and good coaches. Good coaches can't quite get it all together, and that's been Les' story. However, Les seems to be getting it all together now. Time will tell.