This has been brought up alot DPG. I dunno if it makes a difference to be honest.
When you're good, it doesn't matter as long as you're the main guy. Look at pretty much any of the best players on any team, they all get their points because plays are called for them, screens are set for them, etc.
Conversely, when players join other good players, their stats go down. Like KG, Pau Gasol, Shaq, etc. I think Bynum playing with Kobe/Pau/Odom actually lowers his points and rebounds since all of them can score and rebound. There ain't enough ball for Bynum to get more than 10 shots a game and their ain't enough rebounds when Kobe/Pau/Odom all shoot at a high percentage.
Players get their points even when the defense is keyed to stop them. Some of Kobe's best performances came off playing with Smush, Kwamay Brown and Luke Walton.