I agree with the first and last points, but the second point is a little more complex, in my opinion. I agree that statistically, Cam had a CP3-level game, but keep in mind that with Paul there, you still have Cam off the bench. Another thing is not measurable statistically, but CP3 knows how to remain calm when the going gets rough- he's been through it many times, whereas Payne, Book, and the rest of the guys haven't experienced these things before. What I am saying, I suppose, is that Paul's greatest strength is the rest of the team's biggest weakness.
But the important point is, as you mentioned, the fact that it will be a rough game, and the Suns need to be 100% ready for the toughest game they've had yet.