bWAR actually ranked the Cubs 25th in RA9 bwar with 7.4 despite being 9th in team ERA. Fangraphs had them at 19th at 13.4 in 2025, which doesn’t exactly check out either. It appears that the Cubs DRS and a more extreme park factor adjustment cut into a lot of those wins. SOS is factored in too (positional bWAR was 1st at 39.2)….. I wasn’t patient enough to read their entire methodology but they assign 590 wins to position players instead of 570. They’ll penalize/reward position players for GIDP, sac flus. Etc
Baseball reference is more of a baseball encyclopedia than a player evaluation tool, although it’s convenient.