I am not a Green defender or anything, but for the sake of accuracy, let's look at his game logs.
It is tough to really define what a "good" game is versus a bad one, but I gave it a shot.
Here are his good games this season:
19 pts / 3 rebounds / 2 assists / 4 steals / 1 block (vs Portland)
17 pts / 2 rebounds / 1 steal / 1 block (vs OKC)
9 pts / 2 rebounds / 2 assists (vs Toronto)
16 pts / 4 rebounds / 2 assists (vs Utah)
7 pts / 5 rebounds (vs Chicago, only 15 minutes of action)
12 pts / 3 rebounds / 1 steal / 2 blocks (vs Milwaukee)
11 pts / 2 rebounds / 1 steal (vs Washington)
11 pts / 1 rebound / 2 steals / 1 block (vs. Milwaukee)
So that's 8 good games by my fairly arbitrary standards. In these 8 games, he is averaging:
12.75 pts / 2.75 rebounds / .75 assists / 1.125 steals / .625 blocks
In his other 8 games, the bad ones, he is averaging
4 pts / 2.4 rebounds / .75 assists / .125 steals / .375 blocks
The Celtics are 7-1 in Jeff's good games, and 2-6 in his bad games.