This is true and it's why my ultimate dream scenario is that Duncan and Diaw start while Splitter comes off the bench and soaks up all the bench bigman minutes. In that scenario, each one plays about 30 minutes and small ball eats up the rest. By starting Duncan and Diaw, foul trouble is much less of a worry.
But then again, Pop has had 2.5 seasons to figure out how to give Splitter a lot of minutes regularly coming off the bench and it never happened. Perhaps by starting him it will force Pop to up his minutes to at least the 25-28 minute range.
The more that I think about it, while it's not the best alignment in a lot of scenarios, Duncan/Splitter should at the very least help maximize the minutes played by the better players on the team.