We bid for shifts annually. This generally means several graveyard and late swings squads are filled by guys barely off FTO or probation. If you have 18 months on you're on of the senior guys. When you add brand new Sergeants to that mix that results are adequate. If you add a high risk low frequency event to it you definitely see some eye opening stuff. K9 is a fire brigade sometimes with senior guys offering advice or running a scene for a junior Sergeant. When the Sergeant is too proud to take advice it gets sketchy.
I don't know how Minneapolis assigns people to districts and shifts. When you have two new guys in a car either there are no senior people to put in the car or the senior guys refused to ride with him.
The FTO program allows Officers off probation to test. That means you get FTOs with 18 months on teaching brand new guys. I was an official FTO at five years and an unofficial one at three. IMHO you need at least three years to be an FTO and I'd prefer five.