And his conclusions were?
Generally (I'm summarising all the ones I did see) that players like Honus Wagner in his time were anomalous among middle infielders, even in an era where hitting wasn't all that tough or dangerous and a middle infielder was more vulnerable to hard sliding than hard hitting coming his way; and, that decades later middle infielders like Joe Morgan, Cal Ripken, Ryne Sandberg, Roberto Alomar, Nomar Garciaparra, and Alex Rodriguez were likewise---you didn't see too many middle infielders who had their kind of batting skills (with and without power hitting thrown in) too often, particularly when you consider that middle infield play is as rough as it gets. They still seem few and far between enough now, with certain exceptions to the rule.
Sandberg in particular was even more anomalous---he had the batting skills of a number three or even a cleanup hitter but he was almost never batted in those spots. And for a good portion of his career, the Cubs had a first baseman who had the batting skills more of an early-in-the-order man than a number three or cleanup hitter, yet Mark Grace was batted number three for just about his entire career. You wonder: 1) Sandberg would probably have been a Hall of Famer wherever he batted, but you can't help pondering how much thicker his batting stats would have been if he'd been batted third or cleanup. 2) Grace fell short of the Hall of Fame but you can't help wondering, looking at his batting stats, whether he'd have crossed the threshold if he'd been batted where his skills really belonged, in the number two hole that Sandberg usually occupied.
But then that was still an era in which the Cubs were many things but forward or out-of-the-box thinkers wasn't one of those things. They were still wedded to the idea that a middle infielder belonged at or near the top of the order and a first baseman belonged in the middle. They didn't stop to think about those players' batting skills as they actually were and batting them accordingly. They were hardly the only team guilty of that.
