IMO, you say CP3 makes players better thus their averages will go up, but LeBron does the same thing with his teammates, they get better. So J-Rich will be better playing with LeBron, like when he played with Davis in GS.
Also the whole Horford thing...the was the 5th or 6th leading scorer on the Hawks this year and in the playoffs was awful offensivly. I don't see him making huge offensive strides in his game playing with CP3, like the Orlando GM said.