NBA.com under its "Player Tracking" section in its stats mess using the new cameras recording everything, and an area for Time/Possesion, that includes a Time of Possession stat.
IT was third in the league at 7.6min a game with the ball actually in his hand. Trailing only Rondo (7.7) and Wall (7.8), and of course racking up far fewer assists than them with all that ball time.
There is also a "Touches per game" stat that I have pondered using in conjunction with the Time of Possession stat. IT has 84.1 touches per game last year. For instance Kemba Walker, who was 4th in the league in Time of Possession (7.5min/gm) had 100.3 touches a game. What that would seem to tell me is that combining those two stats might give you a statistical reflection of our lack of ball movement/sticky ball syndrome. IT had the ball more, on fewer touches, meaning on each touch he kept it longer. Walker had the ball slightly less, on many more touches, meaning that while he had a high time of possession, he was willing to move the ball and it was passing into and out of his hands multiple times a possession.
Combining together all 7 of these stats: Minutes/gm, Time of Poessession, Touches Per Game, FGA/gm, FTA/gm, Ast/gm, TO/gm should allow you to create a statistical dialogue mirroring the much simpler and clearer observational one: IT has a tendency to hog the ball while looking for his own shot more than others.
For IT:
34.6min/gm (assuming that each team has the ball 50% of the game (highly unlikely), we had the ball 17.3min during ITs minutes
7.6min Time of Possession of those 17.3min (43.9% of the time he had the ball)
84.1 touches per game / 7.6min (456seconds) = 5.42secs/per touch
15.2FGA + 5.7FTA = roughly 17.7 shooting possessions
6.3ast + 3.0TO
compared to Rajon Rondo (as a test case to prove the numbers look different for different style players):
33.6min (so roughly 16.8min/gm on offense)
7.7min Time of Possession (45.8% had the ball)
93.1 touches per game (4.97sec per touch)
11.7FGA + 2.2FTA
9.8ast + 3.3TO
compared to Mario Chalmers (again, now looking for a third archetype for PGs):
29.8min (14.9 per game on offense)
4.3min Time of Possession (28.9% had the ball)
65.5 touches/game (3.94 sec/touch)
7.7FGA + 2.2FTA
4.9Ast + 2.2TO
So what you see reflected by using all those numbers is precisely IT holding the ball like the most ball dominant guys in the league, but using all that time to shoot more often than pass. Is what it is.