Miller was only a rookie pick, Minson will take a lot more than that to get to the club
Miller will also be out of the side as soon as Griffiths is fit, I don't see that happening with Minson, he will be playing ahead of the kids we want to develop and give experience
We either trade for a ruckman who will be our #1 ruck in our next premiership side, or we persist with kids, however I think that trade can wait until the last minute. Just look at how Collingwood & Sydney did it with Jolly, Geelong did it with Ottens. Unless you are West Coast and have a Cox that has come through the rookie draft, you just don't need that gun ruckman just yet.