Just spit-ballin' here. These are the spots I think are pretty much locks at this point. 4 rotation spots with the 5th coming from Smith, Wilson or Gilbert. The middle infield is wide open, and they probably need a LF for a few weeks until Benny's ready.
That all said, they have 5 bullpen spots and 5 position players to fill. They probably top out at 3 lefties in the bullpen, so it's really between Ellard and Eisert for a bullpen spot. Varland, Leasure and Murfee are on the 40-man, so unless any of them get continuously lit up, I think they make the team. If they go with 3 lefties in the pen, that leaves one spot between Clevenger, S. Wilson, Karinchak and J. Anderson.
On the position side, Sosa and Vargas are out of options, so they have to make the team or be moved. LF looks to be a battle between Fletcher and Colas, with DeLoach and Mitchell needing to play out of their heads to be added to the 40-man. The means 2-4 slots get filled from that IF group. Rojas is most probably going to make the team. If Drury is hitting, he makes it, too. That leaves shortstop to be filled by Monty, Amaya, Baldwin or Meidroth. Maybe they use Drury as a backup in the corner OF spots and pick two of those 4 just listed.
This is all done assuming Robert doesn't get traded, and Ramos, Benintendi, Thorpe and maybe even Taylor open the season on the IL. Taylor starting in LF would be the weakest option, IMO.
Rot- Cannon, Martin, Perez*, Burke
BP- S. Smith, Booser*, B. Wilson, T. Gilbert*
Bench- Sosa, Slater, Thaiss
C- Lee
1B- Vaughn
2B-
3B- Vargas
SS-
LF-
CF- Robert
RF- Tauchman*
DH-
RHBP (5)- Clevenger, Varland, Leasure, Murfee, S. Wilson, J. Anderson, Karinchak, Altavilla, Iriarte, Nastrini, W. Gonzalez
LHBP (5)- Ellard*, Eisert*, Shuster*, McGough*, Schoenle*, Eder*
MI (2)- Rojas, Amaya, Baldwin#, Meidroth*, Drury, C. Montgomery*, Gray*, Bergolla*, Ramos
OF (2)- Fletcher*, Colas*, Julks, DeLoach*, Mitchell*, Taylor