It is not where the cap is today it is where it is going. Darius, glenn , spiller , a williams are all coming up . Mario is 18.5 against the cap next year, (they probably have to redo it somehow because the cap hit is equally large.). Next years second round pick will be the starting guard for the next 5 years.
The other thing to remeber is hairston got hurt, he has guard ex from college , by now he surly would be in the mix if not startng