Swanson: http://www.claydavenport.com/ht/SWANSON19940211A.shtml
Albies: http://www.claydavenport.com/ht/ALBIES19970107A.shtml
This is the best place I have found for defensive stats on MiLB players.
It is good to see it looks like the Braves made the correct decision when leaving Swanson at SS and moving Albies to 2B.
It is also interesting to see Swanson projected as a ~3 win player while he projects Albies as closer to a 4 win guy.
The same site also has Acuna as a below average CFer, Robles as an above average CFer, and Eloy about as good in RF as Acuna.
He also projects Acuna and Eloy to be about the same WAR if promoted this instant (0-1), while Robles is much better (3-4, likely due to plus defense in CF).