No, you got it. I’ve experimented with adding arrowroot starch (extremely expensive, just happened to have some to try) and it gave me gas. This is because of starches making their way into the large intestine. I had that with oats too, but not nearly as bad as it was with the arrowroot. I read a research article on the digestibility of starches and potato was the worst so that probably wouldn’t work. I’m not sure about corn starch, and I remember tapioca wasn’t part of the study. They did study some interesting starches like kudzu root however. So, for those of you in the south, you have all the starches you could eat right there!
Here it is: http://www.jbc.org/content/52/1/251.full.pdf “Digestibility of raw rice, arrowroot, canna, cassava, taro, tree–fern, and potato starches”