You got a point there. That we would fail to use player's skills would not be a surprise.
But still, expecting a 6th round RB to have NFL level route running skills as a rookie is a stretch. The odds are he didn't stroll into the league with them. Beasley took years to make a mark, and he was a WR in college.
As for Miles, the deep balls set up the short balls, and vice versa. He wouldn't have been so successful w/o both. Not a great deep threat, but good enough that they had to respect it, making covering the short passes harder.
The real mistake was putting him it the slot. Didn't have the reaction time or hands for catching the ball in the slot. Wasn't really quick either.
Was decently fast, could break back very hard, and could break a tackle. Made to play wide and do comebacks and ups on a single defender. The defender is in a bind because Miles could break harder than he could, but could run by him if he shaded the short pass too hard.