Good point, GUEST,Le Scaramouche

Then how about these?

Every Italian town visited by DeVere became the setting of a Shakespearean play, and every Shakespearean play set in an Italian town was one that DeVere had visited.   That is an extraordinary coincidence, isn't it.   Shakespeare never left England in his life.   

OK.   Well, how about the fact that not one single contemporary of Shakespeare ever gave him credit for writing anything.   Not one.   (God, talk about tough audiences).   Even his last will and testament is so badly worded, for a while it was thought that IT had been written by someone else.   But lesser playwrights and poets of the time were lauded and honored - who on earth did our Bill tick off, to get treated so badly?   He got a lot of attention as a producer and as an actor, but never as a writer.   Rather odd, that.

I think the case that Bill didn't write a great deal is just about as solid as it could be. And of all the candidates for those who did write them, DeVere has by far the most compelling "proof".