The myth is blown all the more up if he had a cowriter. After all, what would it matter if the playwright and poet we know as “William Shakespeare” were actually Christopher Marlowe, Edward de Vere, Francis Bacon or Seweryn Kłosowski on his birth certificate? He’d still be Shakespeare, regardless of whether he knew the tenderloin from the brisket.
That’s interesting about Arden of Faversham. I do still slightly mistrust claims of Shakespeare apocrypha. It’s just too tempting to attribute certain plays to Shakespeare ahead of fellow Elizabethan hacks. Previous software eggheads have been burnt over this very issue.
It’s not surprising. Theater is a collaborative art; a playwright doesn’t just sit down and write. Sections might need to be added to allow for set changes; others might need to be cut due to the logistics of production. (“The Third Murderer has smallpox; we’ll have to do without him.”)
That’s one thing the Shakespeare conspiracy people don’t understand: the playwright is in the theater as the play is being rehearsed.