“Scholarship” that questions authorship based on different writing styles strikes me as particularly weak. My writing style varies depending on the time of day, the day of the week, what I had to eat, how much I’ve been writing recently, the subject I’m writing about, my intended audience, how much time I have to write, my emotional state, how much sleep I’ve had, and more. And that just covers this past week.
Over a person’s lifetime, you also contend with varying language experience, differing levels of maturity, different dictation trans-scribers, different secretaries, different translators, access to different reference material, and more. This can really mix it up.
I’m not claiming that we can’t definitively prove that the authors of “Run Spot Run” and “Romeo and Juliet” are 2 different people. Rather, evidence that relies on writing style can only be weakly suggestive, not definitive.