Brian Fleury is a name I've had an eye on. Very interesting coach, but has only coached offense for 2 or 3 years after initially coaching defense. That's a unique background, and obviously Kyle Shanahan saying "hmm, I think I want you to switch to coaching offense, which is my speciality) is an endorsement, but he may be a little green.
Joe Bleymaier (Pass Game Coordinator) and Dave Girardi (QB Coach) in Kansas City would also make sense. If they had real interest in Kafka, then it shows they're probably interested in Reid-tree coaches and that'd track with John cutting his teeth in GB as Reid got his start there and is a member of the Holmgren tree.