Wemby and Spurs
with Wemby = 44 wins 13 losses (63 win pace)
without Wemby = 10 wins 5 losses (55 win pace)
Celts are 6-1 without JB this year. Does this diminish his value? I don't believe so, but I think a deeper dive is necessary to if this is a major measure of a guy's value to the team. Or maybe you're saying it's not.
I like the with or without you stats.
I do believe they give a good measurement of a player's value to his team. That measurement becomes more valuable the larger the sample size is. 40 games without a player more valuable than 20 games which is more valuable than 5 games without a player. It eliminates some of the noise.
That sample size also becomes much more valuable when you start adding multiple years together because the sample size gets larger. You can see interesting trends year on year + interesting overall career / prime numbers for how much of a difference that player was making to his team.
When you do that, you can see individual years where a player's absence shows no difference to W-L but over 5-7 years shows a clear picture of the team being much better with that player on the floor than off it.
So, the value of the stat is relative to the sample size. I do consider it an excellent stat over several years (5-10+ years) and an interesting single season stat. How interesting the single season is depends on the sample size. It is variable.