Okay, I'll address this post more specifically, because this is something I'm not too fond of in such discussions on this board in general.
ardee wrote:So you're looking at 28-30 wins for the season. I was probably undershooting with 25, but even taking a 30 win team to 57 is gargantuan lift and worthy of top 10 all time peak consideration.
The problem with such methodology is that it kind of misses the point of multi-data players evaluation.
1. KBs advanced boxscore production - measured by BPM - is 5.8. Elite, but nothing spectacular.
2. KBs on/off production - measured by net rating - is +9.0 net and +7.0 on/off. Elite, but short of being historically spectacular.
None of this suggest any historical lift and top10 all time peak consideration. Not saying it wasn't a great anchoring of contender-level team nor it wasn't borderline MVP season level. It was, especially combining with the playoffs (but you were talking about RS specifically, so I'll leave it at this point).
Obviously, it's possible that there are intangibles relevant to Kobe's lift that aren't shown in this basic data.
But we can compare it to the previous regular season of Kobe: Lakers won 42 games with +0.2 SRS.
In 2006/07 season, he was +5.9 BPM, +1.1 net and +6.0 on/off (pretty similar on/off and individual production, much worse net rating due to playing on much worse team). You could've argued his on/off numbers should be better, but it's very circumstantial and lineups-dependent (again, it's another story).
Top12 players in minutes played:
Parker (-2.0 BPM)
Odom (1.1)
Walton (0.4)
Bynum (-1.0)
Evans (-2.3)
Brown (-0.3)
Farmar (-1.7)
Turiaf (-0.7)
Cook (-1.2)
Radmanovic (-2.8)
Vujacic (-1.0)
2007/08 season, in comparison:
Odom (+2.3)
Fisher (-0.3)
Walton (-0.3)
Farmar (1.3)
Radmanovic (0.2)
Turiaf (0.7)
Vujacic (1.2)
Bynum (4.2)
Gasol (5.5)
Brown (-1.9)
Ariza (3.1)
That's why your point isn't too convincing as we have plenty of role players (Vujacic, Bynum, Radmanovic, Farmar, Odom) being more efficient than a year earlier. Bynum (+6.6 TS%), Vujacic (+6.5 TS%), Radmanovic (+6.5 TS%), Odom (+3.0 TS%) and Farmar (+4.8 TS%) - and besides Odom, they were scoring on a higher rate than in '07 season.
Kobe was at 6.7 assists/100 possessions in '07 and 6.9 assists/100 possessions in '08.
To show Kobe's 07/08 RS lift as historical - or, in other words, to find cause-effect relationship - rather than vaguely quantify how many games they would've won in 2008 from 15 years perspective, you have to show what had changed directly in Kobe's level of play in 2007/2008 that from a 3rd player in MVP voting, with pretty much the same boxscore production (less points on better team, but still 29-6-5 before Gasol was traded) - he was able to lift his team, and the same group of players, without influencing his boxscore/on-off numbers, to much higher grounds.
Because there's an explanation in line with data that we have:
1. Kobe was a fantastic player in another prime-ish season,
2. Lakers got better due to better talent (Bynum/Gasol) and role players over-performing (for some of these guys, it was first/2nd-best RS statistically)/improving under the complicated system of all-time great coach,
3. From 15 year perspective - Radmanovic or Vujacic look joke-ish, but they were over 40% 3pt shooters that year with positive BPM and RAPM. Not saying they were per se great players, but you may undervalue them and their RS contribution (even if it was fluke, it still happened in real life, perhaps that's the reason Lakers were +2 net without Kobe on a court that season),
4. Thus, that's why Kobe's BPM or on/off numbers are great, but short of historic - as it's hard to even find a correlation between Kobe's data and improvement of several players, not to mention cause-effect relationship (as correlation doesn't means causality). You're basically suggesting causality without a correlation.
Such discussions are always a matter of interpretation - the more data you have, the more accurate your interpretation may be.
Maybe they would've won 28 wins without Kobe - I don't know. But I think these 'historical lifts' (and players evaluation in general) are more complicated than guessing it in such way.