I'm just plucking something from my brain here, and not thinking all too much, but the thing about phoenix' dying when their owners does sparked some intrigue.
Fawkes wasnt in the hospital wing during "The Phoenix Lament" so is it possible Fawkes died, bursting into flames somewhere else in the Castle? Unless it was seen in the funeral...
Because Rowling once said something like "Fawkes has not been in memories of Dumbledore's office so its safe to assume he is its original owner" or something, so either Fawkes is dead, or Dumbledore isn't.