Is this post literally what has you all jumping up and down throwing bananas?
This article says that they have never worked together, but are both part of the Shanahan tree since he coached under Robert Saleh in SF:
Who is Jeff Hafley? Here's what to know.
www.packersnews.com
I found three articles that said that they are friends, all of which quoted ESPN's Pete Thamel. I've never heard of that guy so I'm not sure that I'm going to trust him as a source. Even if I did, whether or not they are friends makes no difference. We will know nothing until about Week 10 of the 2024. It usually takes about half a season for a defense to adjust to a new coordinator/scheme. Until that point, expect lots of communication errors and mistakes as everyone gets used to the new system.
Alright now, continue throwing your feces at one another!