Yes, but your original point (see above) was that we should respect what people like Sampras SAY ("Sampras said...") over and above what posters like Roy Emerson say. That's talking about tennis, right?
So are you SAYING that maybe Sampras isn't that good "at talking about tennis"?
We know that Sampras is very knowledgeable about tennis beacause he was an top professional player for a long time. What do we know about the poster Roy Emerson?
I'm very interested what is going to be your answer...