These are my top 4

Vance Joseph is a good defensive minded head coach who would be a good leader and would hopefully keep boullen as that would keep chemistry

Steve spagnpuoulo: the perfect guy to be a good leader and would make guys responsible and discipline them. Also would help the defense and would let Kafka be of if he was asked to keep him

Chris Shula is the perfect guy who is the hot coordinator on the market but is also the perfect guy to come in and fit this perfectly

Mike Kafka. He is the offensive guy they need to help dart and skattebo and would fit with this teams as he comes back with experience with this team as the interim.