Are you sure you want to see AD at fullback for another season?
I don’t.
I'd be fine with it. He is great under the high ball, he is committed defensively, he gets metres on his kick returns and he can ball play.
He won't come up with a run like Mbye did yesterday but Mbye has classy plays in him. AD is more of a tough fullback. I think I'd prefer AD there over Mbye. I think AD has a greater chance of filling that fullback role successfully than JAC as well.
I agree with your point about not moving him about too much though. The thing is now he has to learn to defend in the centres. So moving him to the centres has a downside as well.
Assuming we get JAC which is far from a done deal in my opinion we will have 3-4 critical players whose position isn't clear. AD, JAC, Mbye and Brooks will all need to find spots in the team and perform consistently for us to be successful.
It's a tough ask for the coaching staff.