These adjusted statistical models are absurd. There's not some magical formula that will let you compare different eras in some kind of scientific way, no matter how "right" it may feel when you weight the numbers and see names trade places. The game has changed in many ways, not just within the rules as written but in terms of how athletes are even developed, so it's asinine to imagine dropping a superstar of today into an era where many prominent athletes were smoking and drinking, unless you're willing to extrapolate on how raw talent that did put up those mind-boggling numbers might have been elevated with the advantage of modern analytics, performance training, diet, and other benefits afforded to 21st Century players.
I'm all for parsing data, tracking for variables, and looking for new perspectives, but just because math is fun doesn't mean the numbers it can produce are inherently meaningful. Like the saying goes: you can make statistics say anything.