Lopez leads the team with 20.5 points per game, 2.8 blocks per game and a 63.5% True Shooting Percentage. Lopez has scored 22.3 points per game in the Nets' victories, shooting 63.9% from the field with a 71.3% True Shooting Percentage in those games.
The big man is clearly the team's best offensive player, and I don't think anybody would argue that. However, one thing that's been really surprising is that Lopez has arguably emerged as Brooklyn's best defensive player as well, or at the very least, their most important defensive player.
Lopez's Defensive Rating (points allowed per 100 possessions) is a team-best 98.7 this season, and he's actually the only Net with a Defensive Rating under 100 through their first 13 games. Defense has never been known as Lopez's bread-and-butter, but his absence from the lineup has had a dramatic effect on the Nets' team defense.
In the five games without Lopez, the Nets' interior defense has struggled, with a total of 234 points in the paint allowed, an average of 46.8 points in the paint allowed per game. Additionally, without Lopez, they've been unable to match that on the offensive side, with just 154 points in the paint combined in those five games.
Add it all up, and the Nets have been outscored in points in the paint by 80 points when Lopez is out of the lineup, a -16.0 point differential. They are +3.3 in points in the paint per game with Lopez in the lineup, and they've won two of the three games in which they've outscored their opponents in the paint this season.
The eye test shows it, and the statistical evidence backs it up. The Nets are just a different team without Brook Lopez in the lineup. He is their most important player, both offensively and defensively, and if they aim to get back on track in a division that's completely up for grabs, they need Lopez healthy as soon as possible.