I hesitate to name specific FA signings since a third of them will be re-signed by their current teams over the next few weeks.  

 

However  - if the Jags do go for Center in FA  - Wendell or De La Puente are probably viable candidates.  http://www.rotoworld.com/player/nfl/5014...-la-puente

http://www.rotoworld.com/player/nfl/5102/ryan-wendell

 

I anticipate they'll sign a mid-tier guy at guard as well for camp competition.  (and draft one)

 

I'm certain they'll add a pass rusher in free agency regardless of their draft strategy - but if they sign him a week or two into the free agency period - we can probably assume they intend to target a pass rusher early in the draft. 

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