MacKenzie and Schofield plus 3rd talls in Brennan. We then draft another, McGovern is touted as a CHB, Waters and Hurn can play as 3rd talls down back, J Jones is 190 cm same size as Darling. Hopefully Glass can play for 1>2 years, Rance is out of contract in 2013 and if the Tigers are still doing what the Tigers do (which is never play finals) we should be in a great position to trade for him.
As for Brown he was drafted in 2006, debut first round 2007 at the SCG (actually was there, great game, won by 1 point)
But Brown has had a seriously stop / start career and seems injury prone, yes he does have ability but now he's going in for shoulder surgery.
If we need to offer this guy up and he's willing top go in order to get an O'Meara or another top line gun mid we should do it.
You simply cannot point at what Brown has achieved to argue we should keep him as he really hasn't achieved much at all to date.
Emac is pretty injury prone too. The rest of those guys you have mentioned are either not key position defenders or so far away from getting a game, let alone being kept on our list medium term it is not funny.
You then say we should draft another key back, well we won't have many good picks for some time, and the big guys take a while to develop.
We will be keeping Brown unless he asks to be traded, hence while we recently signed him. Still not convinced Schofiled can play on the big forwards either, so you have left the list very thin in Glass's retirement.