According to Cleaning the Glass, Griffin's on/off differential was just terrible last year, a -8.3 points per 100 possessions in 936 minutes (excluding garbage time).
But the year before, in 548 minutes with Brooklyn after a midseason acquisition, it was just great: +11.8 in 548 minutes. He came over from Detroit that year, where he was a push: -0.1 in 626 minutes.
Throughout the rest of his career before Brooklyn, he was always positive, although not by much in the Detroit years (+4.5, +2.6, +2.1 in his partial and 2 full years with the Pistons).
A couple of possible explanations:
- Stick a fork in him, he's done. His year in Brooklyn last year was the acceleration of a trend.
- Brooklyn last year was a very fucked up situation, and he's not nearly good enough anymore to lift up a weird team full of short guards, etc. Put him in a limited role in a better situation, and he can still be a contributor.
It is worth a flyer to see if the second one of those is true.