I was reading White Labs' Homebrew Starter Tips page, and the following got me thinking:
Keeping the Original Gravity low is important because you want to keep the yeast in its growth phase, rather than its fermentation phase. The fermentation phase will create alcohol which can be toxic to yeast in high concentrations.
If the goal is to provide nutrients and oxygen to the yeast to induce growth while avoiding fermentation, wouldn't a very dextrinous wort be best? Would it make sense to produce the starter wort by steeping Carapils alone?