Demar doesnt have two forward-centers who play together the whole game, sleeping, eating and making a living in the paint.
Plus, Gay wouldnt need FTs to finish games.
Rudy Gay is usually forced to be more perimeter oriented with the example you said. Rudy Gay is originally known as a "slasher, who can create a shot and shoot from outside". Not a "outside shooter than can find his way to the basket."