Jeff is anal about reading the ingredients because his girl, Coco, is extremely allergic to any kind of chicken. He can't use the foods with chicken fat, or any chicken meal...nothing. So he uses Wellness, TOTW Pacific Stream, a couple of Natural Balance allergy formulas, and keeps searching for foods other than fish, without any chicken.
Unfortunately as you said, the TOTW Bison and Duck flavors DO have chicken something in them. So he can't use those. The TOTW Pacific Stream does not have any chicken products in it.
I don't get it either. But Kirkland and TOTW etc aren't allergy formula foods ... whereas some specifically are.