Well I'm glad at least Moranis and Pho Sita are picking up what I'm putting down. Definitely better than comments like "the game isn't played on calculators"...
The fact of the matter is, in the NBA it's much, much more valuable to be REALLY GOOD at 1-2 things than it is to be merely average at everything. Average players simply have no place in championship-caliber teams, other than as dead weights who can fill in minutes.
I think people that don't understand this really just don't understand how a basketball game is won (# of possessions * efficiency of each possession).
Everybody here in particular has mocked the notion that Matt Bonner could be more useful to the Spurs. That simply can't be possible, can it? The Red Rocket versus somebody who looks like an actual basketball player? Well guess what, it's more than possible. If you put JG on that Spurs team, every shot he takes is a shot that he takes away from Duncan, Parker, Ginobili, or Leonard. The other team WANTS him to shoot more, and not those guys. On the other hand, Bonner comes in and rarely ever shoots, so he doesn't take any shots away from those very good players. When he does shoot, it's almost exclusively a corner 3, of which he hit 47 percent of during the Spurs' playoff run. So when he does shoot, he's helping his team. When he doesn't shoot, he's helping his team (by leaving the shooting to the more efficient players).
JG on the other hand might provide better better defense, but he's going to harm them on offense with his pedestrian shooting. This is why Green's career TS% is .535 while Bonner's is .588. In other words, this isn't a hypothetical scenario at all... Bonner has DEMONSTRABLY BEEN PROVEN to help his team more on offense over the course of actual NBA games. All of this, without even considering the disparity in salary, which is definitely a factor that leans far in Bonner's favor.
The whole point is, there's a colorable argument here that even if you factor in defense, JG is merely an equivalent player to Bonner. And Bonner is essentially a role player. Hence how one might come to the conclusion that JG could not, under any circumstances, be even the fourth best player on a championship team.
Of course the people who don't understand stats or what I'm saying will just repeat themselves - "Stats can show anything!" (actually no, they can't). Or they'll just claim that what I'm saying is preposterous and can't simply be true "Come on, you don't REALLY think that Bonner is better, do you? You're obviously insane." (despite the fact that Bonner has a higher TS%).