John Anthony's out of favour at Collingwood, maybe he's worth looking into. And I also think Jamar's perfectly capable of dominating the ruck, but players like Johnson, Frawley, Dunn and some of the younger players (Gawn, Fitzy) are perfectly capable of playing ruck when required, although the last two will probably take a while.
But I'd really like John Anthony in red and blue if Malthouse doesn't want him.