Oxfordians claim that de Vere, who died in 1604, had unpublished plays among his papers when he died, that were published and performed only after his death.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.
Macbeth is clearly a paean to James I, who took the throne only 9 months before the death of DeVerre. Among other things, the portrayal of witches as evil movers of fate is a catering to the fanaticism of James. Was Oxford channeled, to write a play probably first performed in 1606, complete with allusions to current events, two years after his death?
Likewise, the farewell scene at the end of Tempest makes clear reference to the theatre in which it is being performed and is a farewell for the playwright as much as for Prospero. Was this staging anticipated by the brilliant Oxford, to match a time a seven years after his demise? All the signs say Will both wrote and spoke the words.