Nobody is saying that Grealish isn't a bigger threat, just that Watkins is a bigger threat than zero.
Not for me to decide, you typed that you have "no reason to fear anything from Watkins" and brought up how he isn't Kane and Lewandowski as if to imply that anyone here thinks he is.
That's very different from the point about him being less of a threat than Grealish that you're now making