I do not understand the total love for Heyward here. He is hitting right now .271 which is 9 points higher than his career average. Sure he is a great defensive player, but as a corner outfielder hitting a lifetime .262 with 20 HR and 70 average per year he is a far cry from an elite player. Bethancourt has shown me little in the way of offense or defense for that matter in his time up so far this year. To replace Gattis with him would be a huge mistake, I would trade CB long before I trade Gattis, remember this was only Gattis' first year as a starting catcher, he will improve defensively, and his offensive capabilities are way beyond what Bethancourt will ever show.
Ad far as starters the only 2 I would consider keepers are Teheran and Wood, Minor should be trade bait along with the entire outfield and 3b. I do not consider LaStella to be a major league starter, nor do I see Gosselin in that role either which means 2b needs to be addressed unless Peraza is all that some people think he is. Peraza would need to be a leadoff hitter and play 2b, is his lack of power any better than La Stella? He has a little more speed but his stolen base numbers are nothing to get excited about. I am not sure he is what is needed either, he has only played 44 games at AA.
Call me pessimistic but I see little in the Braves minor leagues system that reassures me we can right the ship quickly unless some great trades are made or free agent signings, which given the budget restraints will be tough.