She shouldn't have to justify herself though, to her staff anyway. If the AGMs had an issue with it, she would have to justify, and I'm sure they've spoken to her, either before she chose the heads or after.
Thing is, I was assistant news manager within 3 (maybe 2?) months of becoming a news reporter before. @
Samanfa; picked me because I'd been senior before and I knew how everything worked - nothing to do with our friendship. This situation is exactly the same. I'm sure everyone would be more than happy to moan in a few weeks time if Jazz wasn't promoted because neither of the heads really knew what to do. This way, Jade can carry on settling into the manager role, making changes to help the department (that was quite frankly struggling before) and not having to spend all her time settling in 2 new heads who don't know what they're doing.