Found this excellent link in one of the comment threads:
"Alas, Popovich scrapped the Splitter/Duncan pairing Tuesday after it (once again) failed to produce enough offense. The Spurs have scored just 97.6 points per 100 possessions in the minutes those two have played together, the equivalent of what Washington’s 29th-ranked offense has produced this season, per NBA.com’s stats database. San Antonio leads the league in scoring overall, so that drop-off is huge."
I still say the answer is to let Timmy shoot the corner 3 when he and Tiago are both on the floor. Tell me he couldn't hit 40% when his man sags to try and stop the Tony/Tiago high pick and roll.