There's got to be a bit more to this situation than meets the eye. There are teams out there who would love to have a vet CB (Dallas, Pittsburgh, etc) while their younger draft picks get adjusted (or not).
Jason McCourty has missed 14 games in the past two years. Judging by his brother's comments, they seem to be prepared for this to go into the summer. I wonder if he's still trying to return to health, and/or his financial expectations aren't the same as what teams are offering. Or...he could just be a dime a dozen mediocre CB who's been overrated on this forum.