I think some here are getting bogged down in the firing component of this whole situation. This discussion is more focused on culture than anything else and I for one think it's an interesting topic.What in the f#*k is going on here? What is the big deal? We brought Devaney in to advise and that's what he is doing? Getting rid of Banker wasn't a bad move, soooo....
Back to the OP, I don't know if Devaney's alleged distance was intentional or not. I have a chain of command at my work and different subsets of people along that chain. I have my team and the boss we report to, my boss has a team of bosses akin to his level of pay/job title and so forth. Eventually, it all ends at the CEO and his close team of execs. I often don't mingle with the people in the group directly above myself (outside of my boss), but I still have occasional conversations with them. I think we can look at this in a similar way. Devaney probably didn't need to talk to all the staff except the one that really mattered - Riley.
We also all know SE has garnered a reputation of being exclusive, shadowy and at times non-communicative. Much of this impression was built by the former football staff and some of the things they said following their departures.
But, I personally can't read too much into this based on my comments about the chain of command. It's a pretty common format in the corporate world so I guess it may sometimes carry over to something like a college football team and athletic department.