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...then rate PLAYING TIME!  Not garbage stats with no meaning like R and RBI delta.
As for zen and "results"...our current general circulation models do a great job simulating the annual fluctuations in temperature experienced by our planet in the 20th century...that doesn't mean we should trust them to predict planetary temperatures into the 21st century.  I am not one iota sympathetic to that kind of argument.  I spend too much time watching GCMs completely fail to predict climate in the last decade to buy into past-correlation = future ability.
Now, I do understand his comments on making the thing as simple as he can...but it's not adding much complication to switch from RBI/R to PA/G and GS.  And it's not asking much more to get him to include positional aging or speed in his BABIP.  Heck, you can just steal fangraphs' xBABIP which includes a bunch of things that have been shown to improve BABIP over time (LD%, HR rate, speed, high GB/FB etc).