I accept you conclusion that we can do without than having one or two WR's who always want and need to get the ball.
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I guess that it is fine to have many targets producing all the results by spreading around the work. But, let's be clear, our receiving game is about much more that our top 3 WR's. We have our top 2 TE, plus Henderson and Stevenson.
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Our #4 and #5 receivers produce almost nothing unless one or two of the top receivers are out.
For years folks have told me the importance of our #4, #5 and even #6th WR. I have never bought in, except for having a reasonable #4 in case of injuries.