Certainly Bogaerts is a success of the system . It would be interesting to ask guys like Chavis and Benintendi what has led them to get on track or back to their potential . Is it just some maturity or playing in a lower expectation market that allowed them to breath easier and relax. JBJr could address what he thought happened in 2021 to him, and now how it feels back in Boston. He did get paid (like homegrown Barnes) but isn't a start level player. His longevity certifies his status as a MLB caliber player.
Betts would have been a star almost anywhere but he has had some inconsistencies in LA , getting hot once again though. Rizzo and Moncada could both be steady Eddies at Fenway but led to other players coming in and titles won, so who knows.