From both PER and advanced +/- stats, it can be gleaned that Tim Duncan and Manu Ginobili are the best performers in the team this season.
This
advanced +/- stats calculated on a pro-Rockets blog, Red 94 - show that Ginobili is No. 6 (Timmy is No. 4) in adjusted +/- in entire NBA (among top players). That despite the universal fact that Ginobili's performance has been underwhelming offensively especially in FG%. That tells me few things (to go along with Manu4Tres' post -)
a) Ginobili's record is very good against mediocre teams (below .500 teams) and not so much upto mark against + .500 teams - since Spurs have a terrific record against below .500 and mediocre/average record against +.500 teams.
b) Despite Ginobili's underwhelming performance based on his own record..he still plays a major role in Spurs' winning through various means - playmaking being the primary one.
c) RJ's average numbers show that his is the poorest record thus far among the Top 4 in performance.
d) Parker is definitely playing worse than last season, but is doing much better than RJ atleast in PER.
Now that means that the output from the wing position due Manu's offensive liabilities must be supplemented by better efforts by RJ, TP and the rest.
And since we have very little evidence of that so far, the options are to either expect RJ to pick up in the next few games or simply to trade him for a better wing option.
Except he has a difficult contract to move. Therein lies the major problem.