Again...I'm not saying 210 is a weight Lingard HAS to get to
I'm saying....projecting to the NFL....210 is "roughly" the weight where a RB can start carrying a full workload "much more often" - therefore giving him a more value/potential/higher ceiling. So I would "like" to see him get to 210+. Statistics back this, it's not arbitrary.
Duke probably played somewhere between 195-205 at Miami and was awesome. But his size lowers his NFL ceiling. Lingard can play at 205 and be awesome. He'll just have a lower NFL ceiling than if he were 215.
Here's a chart from Brian Burke who does Analytics at ESPN.
His Top 3 NFL Combine predictors for NFL success for a RB are in order:
1) 40 Time
2) Weight
3) 3 Cone Drill
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It' best to be Big & Fast. If you're not Big, you better be Fast. If you're not Fast, you better be Big. If you're not Big or Fast - good luck.