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I like Green a lot and think we will continue to develop, but this valuation seems a little high to me.  Right now, I would argue that Williams is a better more versatile defender than Green and they are roughly a wash on offense.  Herb Jones is a significantly better defender, and the difference in shooting is tempered by Green not taking enough shots.  He needs to pull the trigger more for his efficiency to matter.  Herb might be older, but they are both young and Herb has been in the league one less year.  I would argue that Green is closer to Williams and his contract than Jones.

 I think Green is already a better defensive player than Grant Williams.  I realize Grant Williams has succeeded in certain matchups including against Giannis and Embiid.  However, I think he is an average defensive player overall.  Here's some numbers borrowed from an article by a Celtics' writer, "Opponents FG percentage increases 1.6% when guarded by Grant.  He's in the 45th percentage when defending isolations and an embarrassing 2nd percentile when defending post-ups.  The Celtics defense gets about 2 points per possession worse when Grant is on the floor".  

The Mavericks were 2.5 points per 100 possessions when Josh Green was on the floor vs. off.  I concede you have a better understanding of advanced stats than I do but these numbers favor Josh. 

I agree they are equivalent offensively at this time.  Green has more playmaking potential though.

The fact that Josh Green is 2 years younger than Grant Williams also is a big advantage.  Josh has more time to develop while Grant Williams is less likely to improve.

I would like to see Josh Green extended for the same money that Grant Williams received.  However, I think he deserves more.