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It is a very cool stat, but I think the NFL is misusing this by labeling it as a run blocking indicator. To see why, you have to understand the statistic.
It basically looks at the the position, speed, acceleration and direction of all 22 players on the field at the moment of the hand off. It then relates these 22*5 = 110 data points to the distribution of how many yards the play is likely to generate.
So what this says is that on the Chiefs running plays, on average, the values of the 110 data points predicts the second best expected rushing gain in the league. Most of these 110 variables may not have much to do with blocking by offensive linemen. Is a strong safety playing deep to protect against the pass? Are the linebackers leaning the wrong direction due to Tyreek being in motion? Are second level players flat-footed because the play was slow developing or because of play action? Does the running back have more momentum at the moment of handoff due to RPO? All of these will contribute positively to this statistic and may have nothing do do with blocking.
It is more a measure of the effectiveness of the overall running scheme which depends on many many factors. To call it a measure of run blocking efficiency is really misleading.
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