The Magic have allowed 112.7 points per 100 possessions this season â the NBAâs eighth-worst defensive rating. The Trail Blazers have fared even worse with C.J. McCollum on the floor, allowing 113.5 points per 100 possessions.
These are not statistics to brag about.
YetâŠ
Orlando implicitly bragged about its high defensive rating in a since-deleted trivia tweet.
Rob Perez of The Action Network:
whoâs going to tell them? pic.twitter.com/DmY94IZ4UT
â Rob Perez (@WorldWideWob) April 13, 2021
And Errick McCollum defended his brotherâs defense by highlighting the Portland guardâs higher-than-average defensive rating:
I speak facts not opinion/bias. So besides my experience & knowledge of game hereâs a fact for you. The avg. defensive rating for an NBA player is 110.6. CJs defensive rating is 113.5. Heâs above average by every defensive metric used to evaluate players. What liability? Carry on https://t.co/hJzD9OSS4D
â Errick McCollum (@ErrickM3) April 14, 2021
Unlike the Magic, Errick McCollum didnât delete his tweet. Instead, he shifted his argument:
But the Trail Blazers overall team defensive rating on the season is 116.1. So if heâs at 113.5 that means the team is better with him on the court defensively https://t.co/c99tTyRY0W
â Errick McCollum (@ErrickM3) April 14, 2021
But the Trail Blazers overall team defensive rating on the season is 116.1. So if heâs at 113.5 that means the team is better with him on the court defensively. https://t.co/NfIv4sasgQ
â Errick McCollum (@ErrickM3) April 14, 2021
Hahah they donât understand when you have injuries, changes in rotations, new personnel coming from offseason. It takes time to get defensive chemistry and to establish that identity. Hard to do that or even practice it with all the unfortunate injuries Blazers have had https://t.co/UBftzCZcSJ
â Errick McCollum (@ErrickM3) April 14, 2021
I think Nurk out for awhile hurt the defense, & letâs not forget about Zac Collins. Agile, versatile big who can guard multiple positions, pnr & defend the rim. I believe when you add those two into the mix, it creates more depth, diff rotations, more flexibility in def schemes
â Errick McCollum (@ErrickM3) April 14, 2021
These are good points! Defensive rating is a team stat, though itâs often ascribed to players. Thatâs why I prefer to say, âThe Trail Blazers have a 113.5 defensive rating with McCollum on the floorâ rather than âMcCollum has a 113.5 defensive rating.â
It indicates something positive about McCollumâs defense that the Trail Blazers have allowed fewer points per possession with him on the floor than without him.
But that isnât the full story, either. McCollum has played more with Portlandâs most versatile and arguably best defender, Robert Covington, than with anyone else. The other player in the discussion for the Trail Blazersâ best defender, Jusuf Nurkic, has played a high majority of his minutes with McCollum.
Some advanced defensive statistics attempt to incorporate those factors into a single metric. McCollumâsâŠ
- Defensive estimated plus-minus: -0.9
- Defensive real plus-minus: +1.26
- Defensive RAPTOR: +0.1
With all three measures, average is 0. But the tricky part: In all three, higher is better. So, McCollum rates slightly below average by defensive estimated plus-minus, well above average by defensive real-plus minus and slightly above average by defensive RAPTOR.
This can get confusing.
But defensive rating is a fairly simple statistic.* Itâs just points allowed per 100 possessions. Once you know that, higher is obviously worse.
So, when someone makes the (understandable) mistake of using a higher defensive rating to show âbetterâ defense, yeah, it can still be funny.
*Basketball-Reference previously published a more complicated individual âdefensive rating.â That unreliable statistic has fallen by the wayside. Higher was worse in that metric, too.
By the way, the answer to the Magicâs trivia question: 1989-90, Orlandoâs inaugural season (114.3 defensive rating). The Magic went 18-64 that year, which should have been a clue a high defensive rating isnât good.
Thatâs really the best way to keep this straight: Look for players like Rudy Gobert and teams like the Lakers. Whichever side of the spectrum theyâre on â whether itâs a positive or negative number â is probably the good side.