Don't understand Zion not playing back-to-backs

I don't get it
The Pels started out injured as hell and trying to learn a new offensive system. They are 8-4 in the last 12 games despite having played more games than any other team with one of the hardest schedules in the league and their own fans are still finding reasons to tear them down
The team has great chemistry, the new offense is working now and they are 6-1 during this stretch against winning teams.