I think it’s a huge factor that is being neglected.
Has to love josh as an asset - but if he isn’t ready to manage a full offensive staff solo (and also maybe additionally lose some of his trusted guys to daboll), rework scheme and play call solo, or revamp a playbook during the off-season solo…. It’s not hard to imagine he would follow his trusted superior for his next step instead of taking the better opportunity that lands 100% on his shoulders.