A couple random points:
-In Chandler's player preview, he noted that for whatever reason, Chandler is unable to draw fouls. This has continued this year, with 2.3 ft attempts per game compared to 6.0 for Gallinari. This is why, despite strikingly similar other numbers, Gallo has a marked advantage in True Shooting % of 60 compared to 54.8.
-Because they are on the same team and play a similar position (3/4 tweener), perhaps looking at on/off stats would help:
82 games has Chandler as an 18.0 on offense and holding his opponent to 13.6, for a +4.4. Gallo is at an 16.5, holding opponents to a 19.0 for a -2.5. For adjusted plus/minus, Chandler is a +7.0, while Gallo is a +1.4.
Of their top 12 most used lineups, 4 have both Gallo and Chandler. The ones with just Gallo are -23, -18, -6; the ones with just Chandler are +20, +8, +2, +2, +9.
When on the floor, Chandler helps the knicks to +7.8 on offense, but the defense is slightly worse, as they give up +1 points per 100 possessions more when he's on the floor. Gallo has a similar effect on offense at +7.4, but the defense gives up +4.8 more points when on the floor. Thus the Net +/- for each when on the floor is +6.8 for Chandler and +2.7 for Gallo.
As far as +/-, Chandler probably starts more than Gallinari so he playing with better players.
Nope, that's accounted for. I just looked at their 12 most used lineups.
http://www.82games.com/1011/1011NYK2.HTM#1 (Starters?) is Felton-Fields-Chandler-Gallo-Stoudemire. +74
-so they both get this big +.
#2 is Felton-Fields-Gallinari-Stoudemire-Turiaf. -23
-(so their second most common is to drop Chandler and add Turiaf; -23 for Gallo without chandler)
#3 is Felton-Douglas-Chandler-Gallinari-Stoudemire. -10
-for both, again.
#4 Felton-Fields-Gallinari-Stoudemire-Mozgov. -18
-So now it's minus chandler with Mozgov. Negative for Gallo. So far, the lineup with all starters and just subbing one bench for Chandler has resulted in negatives. And remember, these are listed in order of most minutes played together. So Gallo is playing tons of minutes with mostly starters.
#5 Felton-Douglas-Fields-Chandler-Stoudemire +20
-So here we've taken the starters, dropped Gallo out, added douglas. +20.
#6 Felton-Fields-Chandler-Stoudemire-Turiaf +8
-Or, as in #2, it's drop one of the tweeners (gallo this time) and add Turiaf. Positive this time.
#7 Felton-Fields-Chandler-Williams-Stoudemire +2
-Or swap Gallo for Shawne Williams. Still small +.
#8 Felton-Chandler-Gallinari-Stoudemire-Turiaf +12
-Now they are both in, so both are getting the positive here. This is essentially their "big" starters: drop Fields, insert Turiaf.
#9 Felton-Douglas-Chandler-Stoudemire-Turiaf +2
-Now drop 2 starters (Gallo, Fields), insert Douglas/Turiaf off the bench, slight +. More bench players than any lineup with Gallo so far.
#10 Felton-Chandler-Gallinari-Williams-Stoudemire -1
-Both in, so it won't affect the comparison
#11 Douglas-Walker-Chandler-Randolph-Turiaf +9
-Here's a real bench lineup: Chandler is the only starter. Positive still.
#12 Felton-Douglas-Gallinari-Stoudemire-Turiaf -9
-Gallo with 2 bench players. Negative.
So i arbitrarily limited it to the top 12 lineups by time played. But really, their most popular lineups have almost all starters with various swaps of 1 player off the bench, sometimes 2. So Gallo and Chandler are most often playing with each other or with other starters, and so far this season, Chandler's been on the court for positives, and Gallo for negatives, when only one of the two has been playing at the same time. Most of the time they've played together for a positive, but Gallo's significantly lesser +/- is not because he's playing with the bench; he is mostly playing with starters, but in the negative while Chandler is in the positive with essentially the same players.