So what you're saying is that he's pitched pretty poorly?
The fact that the "nearly ready" guys like Blair, Jenkins, Newcomb, Wisler, Folty and Sims have all pretty much flopped this season is precisely why the Braves made such a halfhearted effort in improving the OF with Kemp. They got a "name" to sell to the ignorant fans at a fairly low cost, and nothing more. If a few of those pitchers had stepped up and proved that they could anchor an MLB rotation the FO probably doesn't acquire Kemp, and instead shoots for a much more expensive/talented player for the OF.
The Braves will not be good next year with the current pitchers, and it would be foolish to attempt to "rebuild" the rotation when ~75% of the organization's talent assets are tied up in pitching. They will make modest acquisitions at C and 3B, sign an innings eater like Jorge De La Rosa for the rotation, and punt again in 2017. If it's any consolation, they should at least be better than the 105-loss team they are now (it would be nearly impossible to be this bad again).
Hopefully by the 2017/2018 offseason some of the young pitchers will have figured something out and the team can make more of a push to improve for the 2018 season.