I think one of the issues here is how "talent" is defined.
If "talent" is strictly based on star ratings and recruiting team rankings, then GWG's argument has merit.
I (and I suspect others) take a somewhat more expansive view of the term "talent." And I don't see star ratings and team rankings as a 100% infallible method of ranking "talent."
There are intangibles at play - some almost impossible to measure - heart, determination, drive, the will to win. Why do certain teams and certain players find a way to win close games, while other, equally 'talented' teams seem to find a way to lose close games? intangibles. I cover a HS team that has a lot of skilled athletes, but almost always finds a way to make a mistake at the worst possible time. To me, that is folded into the definition of "talent."
In that sense, coaching could be defined as helping players realize their talent to the fullest potential. I'm not sure you can separate one from the other. It's almost a chicken-and-egg debate. Where does the value of talent end and the value of coaching begin? How many angels can dance on the head of a pin? Why did I buy a canary yellow leisure suit for my roommate's wedding in 1977? Questions to ponder. (not christian or sam ponder - but sam is still hot)