I'm not sure what to make make of
One thing is for sure...Anderson is not going to get 20 MPG right out of the gates. His shooting should translate, but there are two big adjustments he will need to make. First, he will need to adjust to being a role player. He is going from being the main offensive option to third or even fourth offensive option. He will need to adjust to a system where very few plays will be run for him and he will need to learn that deferring is a better idea most of the time...as the Spurs are better when moving the ball to get the defense off balance then getting it back into the hands of one of their play makers.
The second thing has already been touched on...and that is defense, primarily team defense. He might be able to get by with being a below level man defender, but there is absolutely no reason for him to be on the floor if he cannot learn the finer points of good team defense. Anything he gives the Spurs offensively will be completely negated if he cannot rotate, trap, etc. properly. This is going to take time..as he is not a defensive minded player and was not required to do it in college, so this is the main reason I think it will be closer to mid-season before he starts to see anything in the 20 MPG range.
All of that said, I hope he can be a surprise. It's becoming more and more apparent that the Spurs are not going to have much size or experience behind Parker/Manu/Hill/RJ on the perimeter. One of the young guys is going to have to beat the learning curve a bit and take the reins as a role player. Perhaps he can be the one.