Yes, that cap page is very accurate. The Dolphins were able to carry over $5.3 million, so if the league cap is set at $121 million, the Dolphins cap limit is really $126.3 million. Thought PFT was reporting a couple of days ago that the league cap could be more around $122 million and a NFL reporter even mentioned tonight he is hearing it could be more around $123 million. So right now there is roughly $2 million of cap space floating around.
The Dolphins cap space at this very moment is between $42.4 million or $44.4 million depending on the league salary cap. Also keep in mind that during the offseason that only the top 51 contracts on the roster count towards the salary cap.