If you take out the Joseph minutes and the little used lineup minutes like I did above, here are the adjusted stats of Duncan/Splitter:
Minutes: 99 minutes (181 possessions for the Spurs, 179 possessions for the opp)
FG%: 69-166 for 42.9%
3P%: 15-35 for 42.9%
FT%: 32-47 for 68.1%
Points: 185 (or 102.21 points per 100 possessions or 89.70 points per 48 minutes)
Opp FG%: 74-166 for 44.6%
Opp 3P%: 8-27 for 29.6%
Opp FT%: 24-31 for 77.4%
Opp Points: 180 (or 100.56 points per 100 possessions or 87.27 points per 48 minutes)
Even better three-point shooting and better three-point percentage defense. The low two-point percentage is a concern but other than that, those numbers look promising enough for Pop to give it more of a try.