Why is it that the Oxfords never try to claim Ben Jonson or Kit Marlowe plays for DeVerre? Their history and upbringing were every bit as pedestrian as Will's. Besides, unless he had supernatural help from John Dee, DeVerre would have been very hard put to produce "The Tempest" from beneath the Auld Sod.
Oxfordians claim that de Vere, who died in 1604, had unpublished plays among his papers when he died, that were published and performed only after his death. No source for his plays was published after 1604, nor do any Shakespeare plays refer to events after 1604.