[Tabasco]

The problem with the Dumbledore theories is actually Lord Voldemoort. Old Voldy has to be on a level similar to Dumbledore, otherwise why even bother with Harry? I think it would 'Dumb' down the story if they brought him back, unless Voldemoort says in the beginning of the last book, something along the lines of, "Dumbledore is not dead." Why? Because a wizard comparable to Dumbledore would know if a powerful nemesis died.