Rebounding rate already accounts for the fact that a good defensive team has more opportunities to get defensive rebounds and a good offensive team has fewer opportunities for offensive rebounds. Sounds like the one additional thing you'd be accounting for is the fact that defensive rebounds off of free throws are easier to get then defensive rebounds off of missed field goals. Would the new ranking method be much different from total rebound rate? I guess it would depend on the weighting you assign to two rebound types (FT vs. FG).
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