OldSchoolNoBull wrote:Doctor MJ wrote:OldSchoolNoBull wrote:Duncan: He was the best player on the champs, the #1 RAPM in the league, and the Finals MVP. It would seem difficult to make any kind of case against him here.
Not sure what RAPM you're quoting specifically here, but my guess would be it's one based on the regular season. While any attempt at playoff RAPM is fraught with small sample, I think it can be informative when simply adding playoff +/- to regular season +/- changes things dramatically.
Here's the raw +/- leaders for the regular season (per b-r):
1. Duncan +692
2. Ginobili +675
3. Nash +662
And here's the tally when combining RS & PS:
1. Ginobili +844
2. Duncan +765
3. Nash +728
This doesn't mean it's utterly impossible for Duncan still to have the #1 RAPM if you combine RS & PS, but aside from the fact that I'm skeptical this is the case, if Duncan still keeps the top spot, it will because of what happened in the regular season before his injury.
It's J.E.'s single-season PI RS+PS RAPM that goes up through 2018-19. Or at least I've always been led to believe it was RS+PS. It has Duncan at #1(8.47), Garnett at #2(8.25), and Manu at #3(6.71).
This is a side-issue, but I do just want to raise the point that I think JE’s single-season PI RAPM is really flawed when it comes to actually using it to assess how good someone was in a specific season.
I think a big problem with it is that it uses a player’s past RAPM as its prior (not clear whether it’s just the one previous season or multiple prior seasons with some weighting to it—my best guess is that it mostly looks at the prior two seasons, but I don’t know). This means it will inevitably have lagged effects, where the quality of prior years is reflected in the current year’s RAPM. That wouldn’t matter much if players’ quality remained pretty stagnant over time. But what it ends up meaning in reality is that if a player takes a big leap (or a step down), it will not really be fully reflected in the actual year it occurred, because the prior will unduly pull the value to where it previously was. The upwards (or downwards) trajectory will end up being reflected in later years, in a lagged effect. So, for instance, I think this is why LeBron’s highest RAPM value in JE’s PI RAPM is actually in 2010-2011, even though LeBron was pretty clearly more impactful in 2009 and 2010. This issue doesn’t make JE’s PI RAPM unusable, but I think it’s something people need to think about when looking at a given year. It’s not the most helpful measure IMO when talking about a player that is having a year that is out of sync with the previous year or two in terms of quality. It’s basically as if JE’s single-season RAPM is really more of a two-year or three-year RAPM, because he’s using previous years’ data as the prior.
Why is this relevant here? Well, Ginobili definitely took a leap in the 2004-05 season, and Duncan was obviously way better than Ginobili in the prior year or two but went a bit downwards in 2004-05 due to injury. In JE’s RAPM, Duncan ended up 1st in 2004-05, while Ginobili ended up 3rd. But if we look at the next couple years, to try to see what the lagged effects were, we see that Ginobili was 1st in 2005-06 while Duncan was 5th, and Ginobili was 1st in 2006-07 while Duncan was 3rd. Given how JE structures his prior, I don’t really think we can look at this and come to the conclusion that it really indicates Duncan was more impactful than Ginobili in 2004-05 specifically.