The NL Central was the only division to send four teams to the 2020 postseason. Of course, all four of those clubs were promptly bounced in the opening Wild Card Series, and it isn’t particularly difficult to see why. The NL Central posted a combined 43-55 record against the AL Central in regular season play. (Although this improves to 40-38, albeit with a -5 run differential, if you remove the Pirates.)
I mention this primarily as evidence that the division looks to be a fairly wide-open race entering the new year. The Cubs just became the third different team to win the division title in as many seasons, and they, like the Cardinals in 2019, did so without even breaking a .