Of course it does. If you can have 5+ rebounders on the court, of course that is a positive, but there is definitely a point where adding additional rebounding if it comes at the expense of other abilities is not the best idea.Cody Williams defensive rebounding impact is 21st percentile (adjusted plus minus but for defensive rebounding). Honestly better than I expected, but still not great (and as always these numbers are not 100% perfect). This combined with his absent defensive playmaking makes it hard for him to be a positive defender.
I think there's a theoretical upper limit to rebounding and also likely a point where there are diminishing returns, but the Jazz aren't close to that. I'm not sure a situation where "we have enough rebounding" really exists in the NBA.
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Cody is far and away our best individual defender at the moment. Yes we lose some rebounding having him in vs say, a Hendricks, but the positive defense he brings is way more valuable than the additional rebounding Hendricks brings.