Statistically the C's were a significant net negative with Crowder at PF. Small ball in general was not the great success for the Celtics that many believe it was.
This suggests otherwise.
http://www.basketball-reference.com/players/c/crowdja01/lineups/2016/
Some of the most used lineups with Crowder at PF did show positive results. When looked at deeper though you will see that the only successful lineups shot a million free throws and were used extensively in end game scenarios where I.T. and others were being fouled a lot. Digging through the data after the season was over showed very negatively overall.
Not going to dig through all of the data but here is something I have handy.
David Lee last played for the Celtics on Jan. 10th and this is when small ball started to be a regular thing. Some small ball was played prior to this but was sparsely used. So from Jan. 11th through the end of the season.
Lineups with Crowder at the PF- 398 minutes, +/- -43, that results in a scoring margin of -5.19 points per 48 minutes.
In total Crowder played 1115 minutes and had a +/- of +77 from Jan. 11th through the end of the season. That means when not playing PF he played 717 minutes and had a +/- of +120 for a scoring margin of +7.41 points per 48.
The Celtics were far and away better with Crowder at SF.
I concur (as I indicated above already), with the idea that we really were not a very good 'small ball' team, but I think the problem was not probably so much due to having Jae at PF, but rather with the nature of our rather poor-shooting smalls. Marcus in particular.
If you look at the link to Jae's 5-man data, some interesting dichotomy is revealed. If you sort the 5-man by net points per 100, yes, the 'best' lineup is the 67 minute "small ball" lineup with IT+AB+ET+JC+JS. But the 'worst' lineup is the 44 minute "small ball" lineup with IT+MS+ET+JC+JS. In other words, the swapping out in of Marcus for Avery showed a huge effect on that lineup.
The net 3P% & eFG% swing between those two lineups is pretty dramatic, indicating just how difficult it is to play small ball with limited 'space' because of lack of outside shooting.
I've gone through the exercise on NBAWowy where I set it to have Jae on the floor with just one big at a time (i.e., WITH Sully but WITHOUT Amir, Kelly, Tyler, Jonas or Lee and so on.) to look at the 'small ball' numbers with different bigs at the 5. What I found was that, while varying the big in the middle did have an effect, by far, the biggest effect was from toggling Marcus on/off. Our small ball lineups with Marcus on the floor were pretty consistently awful, regardless of big in the middle. And pretty consistently very good, with most of the bigs. The effect is large, that it dominates over the effect of changing the bigs.