My biggest beef with Richmond's recruiting over the last few years has been the non-recruiting of ruckmen. The draft system allows you the opportunity to draft two ruckmen each year, at least one of whom should be on the rookie list.
By following this process you will end up with three decent rucks for the senior team and two development rucks for the future at all times.
A side benefit is that to make room for your developing rucks to be drafted each year, you should be able to choose three from your existing list to keep and trade a ruckman out for a decent pick every couple of years.
There is almost a cottage industry in stocking up on development ruckmen and trading away your least valuable one on a regular basis.
Geelong, for example, had Ottens, Blake, Mumford, Simpson and West last year. Three for the senior team to cover injury and two for development. Mumford was targetted by Sydney, pick 28 was reasonable compensation and they replaced him with Vardy. When Ottens hangs up the boots in a couple of years, they have his succession covered and won't need to give him an extra year where he can go back to his old habits of sitting in the massage room while he earns a lazy four or so g-spots for doing nada.
The only reason that Simmonds is still there is that we have failed to recruit a ruckman or two each year.