With it all, with his first pitch OPS, and his comfort zone, and his preferences, Heisey is a .750 OPS hitter. That isn't good enough for a starting corner outfielder. It is good enough for a good defensive CFer, but the Reds obviously feel Heisey's CF play doesn't measure up to, say, Stubbs'.
So what you get with Heisey, with his first pitch hitting, with his comfort zone, with his preference, is a fourth outfielder.
If he were more patient, if he walked more than 12 times through August, maybe Heisey could be an .800 OPS hitter and would have a better chance to be a starter. But right now, with his early swinging, with his preferences, with his comfort zone, he's a backup who is getting a chance because of Stubbs' monumental slump.