PCA obviously improved a ton from 25 to 26. Seiya went from 2.6 fWAR and a 123 wRC+ to 4.6 and a 134. Every other regular that stuck around got worse in either fWAR, wRC+, or both. Dansby dropped 7 points in wRC+, Nico dropped 22 and 2 WAR, Happ only declined 7 points in wRC+, but Busch was down 28 and Kelly down 12. Amaya (25) and Shaw (26) had seasons so messed up by injury that it's hard to compare year over year.
2nd half Bregman and improvements from PCA and Seiya (and a hot start to the season from the team as a whole) dragged this team into the playoffs. There will obviously be a lot of roster turnover this year and hopefully we can have a pitching staff with at least one starter we are confident starting in a playoff game next year, but the biggest factors in the 2026 Cubs success might be getting Nico back to around a 100 wRC+, having Busch rediscover his power, and maybe getting a bounce back from Dansby