Garrett to DET would leave ZSmith out in the cold again! Detroit is also feeling the squeeze of being so close and not even making it to the NFCC. They may do something just to do something, especially now that they've lost some top assistant coaches, unless their GM has a lot of discipline. If they make a splash and it doesn't pan out, they may slide downward pretty fast.
If Garrett were to land in GB (yeah, I don't think so but fun to speculate), it would free up Gary to do some damage.