2015-16 RPM: Duncan is 9th in the league with a 5.69, Parker is 64th with a 1.55
On/Off: Duncan leads Spurs starters with a +7.4, Parker is at a -1.4
Duncan/Parker split most box-score derived metrics this season (Parker is better in PER and WS, Duncan is better in Box +/- and WS/48).
And those box score stats don't take into account Duncan's defense or the fact that he is our leader.
Tony's comeback has been awesome. But you're lying to yourself if you think Parker is gonna be more valuable than Tim in a Playoff series, tbh.