Firstly this is only my opinion and I can't really back it up with any facts but here goes.
Players mentioned earlier would require a draft pick plus either another pick or a player. If Richmond were to get Murphy or Power we would be playing it safe by recruiting a proven player but we potentially lose 2 good players in return (draft pick or decent player eg Torney).
Its no secret that Richmond have depth problems but IMHO its much worse than most will admit. We have problems on every line and recruiting a couple of players here and there isn't going to fix it. We need a major influx of talent (20+ kids) over the next three years. Maybe only half those kids will be any good but those combined with Cogs, Newman, Rodan etc are our the new core group for the next 10+ years.
Recruiting an established player like Power or even Kayne Johnson should be left to clubs with a solid core but a few accute weaknesses (eg Collingwood). Not Richmond who have problems everywhere on their list and an aging core group who are mostly past their best (eg Campbell and Richo ).
I feel dirty for saying this but it looks like Campbell is past it due to injuries and although someone like Power might be an adequate replacement, we are still only left with 3 decent midfielders. Still no improvement in depth and we potentially lose 2 picks under 20.
In summary, get as many picks as we can over the next 3 years and draft the best players avaliable with each pick. If that means we end up with 15 midfielders then so be it. Once we have a decent core group then trade for what we need.
Hope that clarifies my position a bit and now let the flamming begin ;D