One other factor is right now Monty is still rolling out lineups without CP3 and Book. I suspect once playoffs roll around one of the 2 is always going to see the court. That will help manage the drop off when CP3 is off.
And even with that bad long 3 by Booker, he's had a tremendous 4th. Great defense, that offensive rebound was also big... he's rounding out to be so much more than just a scorer.