I just don't see the whole Swanson/Albies at the same time argument. This is a rebuilding team which means if everything goes like the FO would like 2017 will see several first time players, not just Albies but maybe Ruiz, Peterson, Newcomb, Minter, etc. I guess the line of thinking is that both will be superstars, both will require a lot of money eventually and you don't want two MI hitting their 5th year arby both getting $15M per year. But that happening is likely extremely slim.
I think you bring players up when they are ready AND when it best helps the controlling team.
If the Braves wanted to start next season with Swanson at SS and Albies at 2B, and those guys earned it in ST, then fine. I would have no problem with that. That would allow the Braves to NOT have to protect either on the 40 man until the end of ST, it would not start their clocks until 2017 and it would give you a marketing hook for the great unwashed. In the mean time, the Braves would have an extra space on the 40 man to protect their own players, sign "flyer" free agents, utilize the rule 5 and spend all spring evaluating the occupants of those 40 man spaces before having to clear space for Swanson and/or Albies.
That approach would have also allowed Swanson to continue to play with Albies, establishing that ss/2B teamwork and would also have allowed Swanson to refine his offensive game.
Swanson is refining his game at the MLB level. He's a college kid and he's not going to learn how to hit MLBers in AA. The 40 man argument is whack. There is a lot of filler on there that can be dropped (which has recently happened) that has no impact on any of that. There is not going to be any point this off season where the team is like "Man I wish we could take a chance on this guy but we have Swanson on the 40 man. Too bad".