I've noticed a huge difference in the frontcourt dynamic since the UCF game. Knowing that his playing time is going to go up with Yakwe out, Carlton has played more confidently and in that small sample size Carlton is averaging 9p, 8r, 1b in 32 mpg.
In those two games, Cobb and Whaley have played a combined 19 minutes, so there hasn't been much of a difference between their playing time, but if Carlton needs someone to play his spot due to fouls or injury, I'd prefer Whaley.
After a hot start, Cobb hasn't been that good and he isn't part of the future, so Carlton should get as much run as he can and Whaley is the first frontcourt guy to backup at the 5.