If Saints cannot get Flanagan then having him be an assistant to a rookie is not ideal. Flanagan will be allowed to coach in 2022 so why would he make a rookie look good at his job when he knows that if the rookie fails they will turn to him to give him the job in 2022. I know he will try hard to help the rookie, but how hard and if the rookie fails the rumour mill will go crazy with this notion that Flanagan is backstabbing etc.
I think the only solution is to give Flanagan the job for 2022 from now and let a rookie get a year under his belt in NRL for future job. Whether that be Young, Fitzgibbon, Ryles, etc. As a rookie looking to get experience why not take the 1 year as an apprenticeship type experience to coach in the NRL.