Carey is back to #1 on kPOY, slightly ahead of Dotson, Garza, Howard and Toppin.
Lately, he has been playing more minutes despite more foul trouble, which is a sign that K will rightfully try to put him on the court as much as possible in March. Starting with the loss at Clemson, his average minutes per game has been around 30 with 3-4 fouls in every single game. Before that game, he was typically in the low-to-mid-20s with 1-2 fouls in each game.
The workload doesn't seem to affect him. 31% usage with 116 ORtg is phenomenal. A very small percentage of players pull of 115+ ORtg combined with 30%+ usage against a high major schedule. Jabari Parker 2014 and Nolan Smith 2011 were the only other players in Duke Kenpom history with over 30% usage, and they were at 111 and 112 ORtg, respectively. Those were two of the best individual scorers ever at Duke, and Carey has been significantly better.
The best individual season in terms of offensive efficiency, considering usage level, in Duke Kenpom history was probably JJ Redick in 2006 (29% usage, 120 ORtg).