My grandma, who I knew quite well, knew her Dad who knew his grandma who knew her grandpa who knew his grandma who knew her father-in-law who knew his grandma, aunty to the lady above, whose family were adjacent to and connected by marriage to a family who knew William Shakespeare quite well. By my count The Bard wrote his own stuff albeit a great deal on a "cut and paste" basis for plots and themes.
There were just too many people around in Warwickshire and London then and later who would have been aware that he did not had that been the case and the later generations were around Lichfield at the time of Garrick and Johnson.
He would have made a great blogger. So there.