I would consider that more of a kickoff than a culmination, but YMMV. It's not worth throwing a parade over, but since the start of 2019 the Cubs are 14th in bullpen ERA despite investing in no one of note except Kimbrel (who ironically was the worst part of the pen for the first half of that period) and selling off all the best parts this past July. There's also some obvious wins on the PD side, but those take longer to pay off. But like, that's where the edges are at this point. There's no longer low hanging analytical fruit ready to be discovered and completely take the league by storm. It's "buy millions of dollars of radar equipment and commit four full time analysts to trudge through the data and then you can reliably buy a pretty good bullpen on the cheap." Before that it was catcher framing. That's where Moneyball is when there's only one truly dumb front office left. And the Cubs specifically are no longer cutting edge obviously. Probably still top 3rd of the league? Yeah, all of that is true, which is why I think its overfitting to attribute the Cubs's stat investments for the success of three reclamation projects. It's just a pretty small sample size. They signed some scrubs who had mild success. The stat guys probably had a hand in it, but its a reach to say those three are the fruits of their labor (or that their labor was bound or even likely to be fruitful.)