CK made some decent long passes downfield last year. We've all seen the throws to Britt.
But throwing a deep out on a line (and some other throws that need to get there hot) are different throws. Just because you can loft one 50 yards down the hashes when your WR has his guy beat and just needs to run under the ball doesn't mean you have the arm strength to hit that 20 yard out pattern where the WR and defender(s) are coming back to the ball. They are just different throws.
Young's, I think it was Young, point was that the defense doesn't need to defend the entire field with CK throwing the ball.