Sadly there is a great myth in commercial aviation that trainers will make good managers, forgone conclusion.
Nothing could be further from the truth. Managers need to be professionally trained as such. Trainers are one level of authority above a line captain and that one level does not constitute or substitute for proper management training. I can count on the fingers of one hand the trainers I know who have gone into management and succeeded, most others were on a personal advancement exercise or ego trip.
There is no alternative to professional management training and successful management requires inbred aptitude just as much as flying does. Simply being an ex commissioned officer doesn't even start to cover it.