No shortcut I can see what they were trying to do but I think Post has shown enough in the 2s to suggest that he can play Millers role.
Miller can't play down back, at least Gourdis and Post can swing if need be.
Miller was brought in incase Vickery went down and we had no key forward except Jack and his development would have stopped if he was triple teamed every week.
Vickery has improved enough to take the 2nd forward role confidently. Miller as a 3rd tall is no longer needed now that Posts form in the VFL suggests he deserves 2-3 games in the 1s.
Annoyed Tuck wasn't given a forward role like Millers.