Don't worry, they'll use the remainer of the cap. $17.8M under right now. The rookie pool is around $5M and they'll leave about $2M sign veterans in week two (Fina & Frederickson??) and other players if the injury bug arrives again this year.
That leaves about $10M. They'll probably sign two or three more guys (e.*. Robinson, Muhammed & McGlockton) and use the rest to extend players, since four starters becomes FA next year. (Shelton and Thompson becomes UFAs and KVB and Wilson becomes RFAs)