SNCO leadership qualities do not necessarily read across it is argued that it is a different type of leadership so further training is deemed necessary to highlight these differences. Not all Hairys on IOT do well, especially the Ex SNCOs who are some times set in their ways. I think they should do a training course but perhaps not the full IOT.
And before someone mentions the army system, few of the automatic commissions become platoon cdrs etc and lead the men into battle, they normally end up behind a desk or similar. I believe it was called a QMs commission years ago, not sure if it the same now.