https://www.basketball-reference.com/players/b/bryanth01.html
https://www.basketball-reference.com/players/g/greenja01.html
https://www.basketball-reference.com/players/w/willigr01.html
https://www.basketball-reference.com/players/w/watanyu01.html
Three of these guys are worth the minimum according to Hollinger; the other is worth $15+ million.
Yep. That seems about right to me. All four played with winning teams this past season. Their net ratings on said teams:
-4.2
-1.2
-8.2
+5.3
Looking at playoff performances we get:
Played 1 minute
Played 5 minutes
-16.5
-3.4
I know there are some issues with net rating, but when you're looking at full-season numbers for players on good teams, that starts to wash out a bit. One of these guys was on the court when generally good things happened to his good team during the regular season. The other three weren't. In the postseason, that continued to a degree. Two of them couldn't see the floor. One saw the floor and his team was generally wiped out. And the last saw the floor and was a mediocre playoff rotation player. Not a star, not a scrub.
No one has ever argued that Grant is a volume scorer. But when you compare what happens to his teams with other players who also tend not to score much, despite relatively efficient scoring when they do, it's clear Grant's value isn't in points scored, which is not the same as having no value. And that salary gets steep, quickly. A marginal NBA win is worth somewhere in the $3.5 million to $5 million range, on average, depending on your analysis. But NBA teams shouldn't treat wins marginally -- that extra win is worth much more to a contender than to a lottery team. Even if Grant is worth a single extra win over JaMychael Green, that's several million in salary. Two wins can quickly get you into the $10 million range. Is Grant worth $15 million? I think plausibly. Is he worth $8 million? Sure, that's plausible also. Is he substantially different from a minimum-salary player? Yes.
Analyzing stats is fine, I do plenty of that myself, but I also watch the games and assess players based on what I see. Some players, I don't get to see play much, so then, I have to rely on stats. Of the available stats, On-Off splits, like the ones noted above, are probably the best thing you have to go on. With Grant, I have seen him play plenty, so the stats only form one part of the equation.
Grant is a solid bench PF who is versatile to play some at C and even wing. I have no idea how many win shares he should get but I have seen him help a top NBA team win games, including in the playoffs. I have never seen Bryant do that (for example), at least not since his injury. Not all 8 and 5 players are created equal.
Celtics2021's analysis of the wins and contract seem pretty in line with my more subjective analysis. Player value is shifting due to the new CBA rules but I would have no problem paying Grant $10M. $15M is starting to feel a little rich to me. But this is based on past performance and prior CBA structures. Things may well change. Grant may hold more or less value, I don't know. But I value Grant much higher than the Thomas Bryant I have seen the last couple of seasons.