I think this is affecting D.West, Roy, and Hill more than it has affected PG. PG knows he's going to get his FGA regardless (good FGA be damned) The other three starters have been knocked down the totem pole by a player that up until this year was seen as a complimentary piece as opposed to a featured piece.
I think everyone is professional enough to accept their role and accept the erratic/demonstrative play of Lance when we are winning 65-70% of our games. But now that we have hit a rough spot, they don't seem to be quite as accepting of their new roles within the offense, and they're wanting Lance to play more within the team. In Lance's defense, he had to wait two years of being buried on the bench to get his chance, and last year he sacrificed individual numbers in order to be that glue guy I mentioned before. Now he's shown that he's a player in this league, and he doesn't want to go back to a reduced role.
So now what do we have? We have PG who is struggling with defenses concentrating on him, Lance trying to show that the offense should run through him more (as it did earlier in the season), and 3 other starters who are trying to prove that they should be a more focal part of the offense as they were last year when we were a game from the NBA finals. This all equates to too much ISO ball, too much holding the ball (or dribbling in Lance's case) and not enough passing/facilitation.
Just my opinion of course