Clubs that employ a DoF normally don't have a manager as such, they have a first team coach, who has to be on the same page as the DoF with regards to club philosophy and style, as well as squad personnel to an extent.
Sacking the whole scouting set-up is a very unusual move, even if a DoF was being employed.
A New DoF would only need to notify the existing scouts of the type of player the club needs. Easier than setting up a whole new scouting system with their knowledge of other players noticed while watching specific targets.
As Bruce doesn't do training/coaching it's hard to see him working with a DoF, no matter who it is.
I find it strange that the seven, scouting young talent, are sacked and the next day it's reported that 35 year old injured centreback James Collins is asked to train with the squad.