Actual: 9/72 against (12.5%)
So if we allow 25% on the season, that number becomes 18 made. Being conservative and assuming that on NONE of those misses did the other team grab an offensive rebound and score, which is almost certainly not true, that's an extra 1.8 threes scored per game on possessions, adding 5.4 points against to the average of 67.8 possessions we are playing a game. So our Defense goes from 0.84 to 0.92.
And considering that teams almost certainly score at least once or twice off offensive boards, that number is probably exaggerated.
We should be getting credit for chasing guys off the line though.