IF - a huge if, of course - Seattle would bite on O'Neill, I'd probably jump at that personally. Just don't think Arodys holds that much value IMO. Couple that with a Teheran for Gallo swap and the only money you should need to spend moving forward could be used on a replacement for the two of them since no one seems to want to spend on any free-agents.
CF- Mallex, SS- Swanson, 1B- Freeman, LF- O'Neill, 3B- Gallo, C- Flowers/???, RF- Markakis, SP, 2B- Albies
Package Inciarte, Peterson, and an arm or two and go after a Sonny Gray to replace Julio at the front of the rotation.
The issue that I see is that many people are using the thought process of building for 2017, 2018 instead of a longer term process that looks at improvement in 2017, being good in 2018, realistic contention in 2019 and beyond. The thing is that the FA possibilities after this season are fairly horrible and considerably limited.
Could the Braves sign Cespedes? Maybe. But, he's going to be extremely costly and is getting on the wrong side of his career. If you do sign him you have to hope he will maintain but be prepared for a gradual )hopefully) decline, say just as good in 2017, 15% off in 2018, another 15% off in 2019, another 15% off in 2020. So, you would have a guy who is 50% of the player he is now on your team in 2020 but making as much money or more than he makes in 2017. It's a huge gamble based on the desire to be competitive in 2017.
Could the Braves sign Desmond for LF? Almost surely. But should they? He's having a career year in an extreme hitters park surrounded by an excellent team. Is he the player you see today (the one you pay for) or is he the player who played in Washington? Players blossom all the time but how would everyone feel if he was doing this in Coors?
The point is that the Braves young talent isn't likely to be huge contributors to success in 2017. Atlanta doesn't have a Harper or Trout or Clemens or Martinez ready to jump from the minors straight to the All-Star team. Guys like Albies, Swanson, all the young pitchers, are likely to come up and struggle a bit before settling in and either growing into good (maybe great) ML players or wash out to be replaced by others who will likely go through the same process. Look at Wisler, Blair, Folty, etc. and you see the process working with the young pitching.
Even IF the Braves sign top FA talent in the offseason (and the hit rate on targets that are actually good and fit needs will have to be off the charts because of the lack of options), the youngsters are still going to struggle. 2017 is a pipe dream. That's why you have to think of 2018 and beyond NOW.
Even Teheran, Freeman, Viz all lose value, maybe significant value, over the next 2-3 years simply because they get older, more expensive and under less control. That doesn't even take into consideration possible injury or outside influences such as PED suspension (Viz).
The farm is improved. It may actually be one of the best overall in the game. However, the rebuild isn't close to being finished and can't (or shouldn't) be rushed.