from 2016 forward, some guys didn't develop into what we thought (mainly schwarber), some had some injuries, heyward turned out as badly as it could, quintana wasn't what we expected and darvish had a wasted year and a half. lester got old. zobrist got old and retired. few other things went wrong too, but i'd say blunted/early aging curves for the young guys is far from the top of the list. maybe heyward qualifies, if you want to call it that? other than 2020, KB has been mostly great while missing time from time to time, Rizzo has pretty much been Rizzo, Javy took a massive leap forward (again, aside from 2020), and contreras has only gotten better. russell did go from a thing to nothing - there were obviously some unusual horsefeathers circumstances (him being a complete piece of garbage) that probably were involved with him falling off the map, but that was sort of offset by javy going full superstar. we'll see if 2020 was a blip or not for him. mostly i think it was fowler going, zobrist getting older and going and the pitchers getting old/mediocre. There were also no waves of new prospects replacing those that got old or bad. The jury is still out obviously but the best homegrown pitcher in the 9 years has been Duane Underwood?