Can't say that I agree that all of our locks are potentially 8 or 9 out of 10. At the national level, we seem to have a penchant for selecting bean-pole locks who just might be good at lineout time, but are quite powder puff at the rest of the game.
I saw on another thread where some one posted that many of our players seem to have been coached from school days to run at the opposition and go to ground quickly to recycle the ball. That seems to be especially relevant to many of the locks we've had in the Wallabies for quite some time, thinking Nathan Sharpe, Timani (the elder), Rob Simmons, Dean Mumm and Sam Carter. Time we muscled up at lock imo, and the likely ones are Douglas, Coleman, Arnold and Staniforth. Lopeti to me is a No 8, not a lock and I don't think Big Willy plays with the aggression his size should dictate as well as being a little deficient at set piece.