There is some contradictory information about resting players.
From Inside Science Monday, October 16, 2017 Marcus Woo, Contributor:
Last March, the seemingly invincible Golden State Warriors looked mortal. One of their superstars, Kevin Durant, was out with a knee injury, and the team had lost four of six games.
Citing the need for rest, head coach Steve Kerr sat his healthy star players for a much-anticipated matchup with the San Antonio Spurs. The Warriors lost that game, but their refreshed squad won the next 14. On their way to a championship, they won 16 of 17 playoff games. The rest, it would seem, helped.
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Player Efficiency Rating, a number that encapsulates a player's overall performance, between 2005 and 2015. Box scores indicate whether a player missed games due to injury or rest. Considering only players who played at least 20 minutes a game, didn't change teams midseason, didn't miss more than 10 games for rest or suspension, and hadn't missed more than 20 games for any other reason, the researchers split the cohort into two groups. One group included players who rested fewer than five games and the other consisted of players who rested five to nine games.
The researchers compared players from the rested group to players from the less-rested group of similar ages, positions, minutes played, Player Efficiency Rating and team success. This way, they're not comparing a superstar like LeBron James with a mediocre player.
They found that the numbers for rested players were statistically the same as those for less-rested players. And players from both groups hardly missed any playoff games due to injury. Resting, at least for the playoffs, didn't seem to matter.
https://www.insidescience.org/news/...yers-during-season-may-not-help-them-playoffs