From eagle 21 picture. Well the rudder is composite and the blue ends at the trailing edge; strange how some rivets are torn through and others just popped; the aluminium non painted piece looks whole and with no external paintwork unlikely the nose of the rudder, presume could be a back closing panel of the V.fin where the nose of the rudder swings, the green bracket also that area. and so rudder flutter and delamination less likely in MHO.
JAL123 a B747 RPB repair failure leading to an over pressurisation in the tail section comes to mind, though it is unlikely to have been started in this case by a cabin air loss as blow out vents are now designed to cope with this..