The Eagles have lost safety Marlin Jackson to a ruptured right Achilles tendon in practice.  He will miss the whole 2010 season for the Eagles.  In the Eagles’ initial depth chart Jackson was #2 at free safety behind rookie 2nd round pick Nate Allen.  This injury will hurt the Eagles because it will pretty much force them to start Allen with no fall back option.  Look for the Eagles to be scouring the rest of the free agent market for a veteran safety to bring in to back up Allen.