Hacl,
I think you need to hear some Basketball Analytics 101:
Axiom #1: There is no action a basketball player can take which isn't somehow affected by the play of his teammates.
Some actions are less affected than others. For example, a guard's ability to stay in front of his man on defense isn't as affected as, say, his success at team defense. For example, free-throw shooting is much less affected than, say, finishing at the rim. But, nevertheless, all actions are somehow affected.
AXIOM #2: (a) If all actions are affected, then there will be no statistical representation of a player's individual action which isn't "polluted by" or "alloyed to" the play of another player. (b) All statistics of individual performance are skewed by team-play in ways that are NOT revealed by the statistic itself.
CONCLUSION:
When you demand to know if RPM or any other statistic is "effected" by teammates, then you are revealing your ignorance. The answer is "Yes, just like every other statistic.... So what's your point?"
What you don't seem to realize is that RPM and the other stats I listed make it easy for the analyst to acknowledge to affect of teammates. They allow us to say "It looks like Zach LaVine made a bad team worse."
Does this help?