KU’s new defensive scheme, a base 3-4, will vary depending on the situation to a 3-3-5. In the 3-4 set, KU will have a “Jack” linebacker that can be swapped out for a “Hawk” defensive back when the situation calls for it. So no, your math is not wrong, we are indeed previewing 12 defensive positions!
Last year, the secondary was expected to be one of the bright spots on a Kansas defense that lost most of its front seven. This year, the opposite is true, as the Jayhawks return just one starter in the defensive backfield from Week 1, and I for one do not expect the return of CB Corione Harris, although he is still listed on the 2020-21 roster.