Ron Rivera wasn't a good assistant?
And in terms of recruiting: Imagine being a high school kid with Smith walking into your living room instead of Cubit. Smith has had success in both college and the NFL. He knows what it takes to get to the next level and win there. Cubit can't touch any of that. Not many college coaches can.
It was something of a power struggle between Lovie Smith and Ron Rivera and Lovie forced Rivera out. That might have been the beginning of Lovie's end in Chicago. If Lovie hires an offensive or defensive guru for coordinators, hopefully he lets them do their thing.