I honestly don't see a different player from last year, just a player getting more minutes. Even despite his torrid start (so Including it, NOT ignoring it) it looked to me like he already settled into the same player as last year.
I checked all the numbers I could, and couldn't find any that really disagree with my visual assumption.
From ESPN:
-PER is 11.92 compared to 11.59.
-TS% is 52.7 compared to 50.0
-Points/Rebounds/Assists Per 40m=
10/11= 14.2/6.6/1.6
09/10= 14.6/8.8/1.5
From 82games:
-eFG% is .482 compared to .437
BUT
-His foul drawing is down to 12% from 19.4%
(which explains why his True Shooting % from above is largely unchanged; better shooting (taking more open shots) but not aggressively getting fouled).
-This year his shot selection is 65% jumpers, 32% close; last year it was 42% jumpers, 55% close
(This explains why his free throw attempts are way down)
-This year he is outplayed by his opposing counterpart by -4.1 (Davis's efficiency minus Opponent's efficiency); this is an improvement from last year's -5.4
-His adjusted +/- (on/off) has gone from -10.4 to -16.9
(Probably because he is being compared to this year's KG, Shaq, and JO; obviously KG this year looks better than last, and Shaq has exceeded expectations; in fairness to Davis, most players would be a net-minus compared to KG/Shaq).
So, yeah. Same player, backup level production, more minutes.