Here is my take on the how the roster for position players is going to play out. I think there are two (somewhat related) battles affecting the last two spots. There is a spot available for a righty or switch hitter who hits better righty who can play center and give Inciarte a game off now and then against lefties. Bonifacio and Francoeur are the competitors there. The other competition is for the right hand side of the platoons at second and third. The competitors there are Bonificacio, Beckham and Garcia. Bonifacio figures in both competitions, illustrating the advantage he has due to his positional versatility. If he "wins" both of these two competitions, it would also open up the possibility of the team keeping both Swisher and Bourn. Interestingly enough, if Bonficacio doesn't make the team, one of Bourn/Swisher is also likely to go (barring injury).
With that as a preamble, here is how I see the team shaping up when it breaks camp.
Catcher obviously is a platoon of Flowers/Pierzynski.
Third I believe will be a platoon of Johnson/Bonifacio. I like Garcia, but barring injuries, I think he starts the year in AAA. Even in that scenario he is going to get about 300 at bats in the majors this year.
Short is Aybar. Bonifacio, Peterson and Beckham could all fill in on a short-term basis. If Aybar goes on the DL or is traded, Castro would likely take over at short.
Second is a platoon of Peterson/Beckham.
First is Freeman, with Swisher or Kelly Johnson as backups.
Starting outfield is Olivera, Inciarte and Markakis. Bourn will play some in left. Swisher will be our main bat on the bench and will play some at corner outfield/first/DH as injuries arise.
I think the guys on major league deals have a slight advantage over the guys on minor league deals or with options (Francoeur, Garcia) in the battle for the last two spots. It is not determinative, but if the other factors are close it will come into play.
I like the depth we will have in AAA: Lavarnway, Brignac, Castro, Garcia, Frieman, Smith, Francoeur. We have cover for all positions and a good mix of lefty and righty hitting batters. In particular Brignac could fill in as the lefty part of a platoon at either third or second.