I think the actors wrote the plays. They probably improvised scenes and somebody just wrote down what sounded good.
If anyone ever tells you that you put too much Parmesan cheese on your pasta, stop talking to them. You don't need that kind of negativity in your life.
Actually, many of the plays were transcribed during performance - allowing the transcriber to add and arrange things apart from what Shakespeare or the actors had performed. These were later edited and put in the folio or quarto. That is why there are slightly different versions of the plays. (See Hamlet for example) So, in many ways, you are right Gothampc.
That being said, Contested Will is the way to go. Personally I feel the plays stand apart from the author but I believe Shakespeare was a man of exceptional talent from Stratford Upon Avon.
"All our dreams can come true -- if we have the courage to pursue them." -- Walt Disney
We must have different Gods. My God said "do to others what you would have them do to you". Your God seems to have said "My Way or the Highway".