So are you maintaining that players on those other teams don't benefit from good coaching? Beg to differ. Consider the recent comments of LFB (granted he may have been out of line in how he presented this). LFB practically screamed numerous times that Haslett has been severely mis-coaching players over the last several years. I would venture to guess that this may have even cost this team a few victories.
A good coach will adapt his scheme to match the talent. Gruden apparently sees this differently. Hopefully he learns & along the way finds some more competent asst coaches. Also - remember that the coaches generally have some input for the draft.
Never said that, the point that you're missing is that this team in relation to others fails to get players that fit their scheme from the jump. Very good example is Brian Orakpo a player who for the entirety of his career was a DE. So what does DC do? They draft him and attempt to convert him to LB'er. If you want a OLB'er with the 13th pick of the 1st round select a LB'er who's done it his whole life and come in with the skills that fit your system.