Oxford was dead before a third of the works were written
A very common reason given for Oxford not being the author of the works of Shakespeare is that Oxford was dead before a third of the works were written. This video shows that the evidence does not support that statement.
I believe that the plays were regularly updated to include whatever topics-de-jour de Vere thought would bring a chuckle to his aristocratic audiences. That makes dating the plays so difficult: events like the Gad’s Hill prank from 1573 would remain intact as they were being revised. It’s analogous to a paleontologist finding a site where all of the geological strata is jumbled up. The only clues to a play’s dating would be within a range as Dr. Gilvary says. Whatever evidence we find has to be matched to some event that the playwright experienced or read about before we can say that a play dates from “such and such period”.