Richmond is a pressing side, has a decent midfield with Prestia and Cotchin and has an AA back in Rance that will negate Walker. Your backline is too tall to cope with Martin, Reiwoldt, Costagna etc.
It will be like the Showdown was. If you roll in thinking it's only Richmond and who have they beaten, you'll get done over. You need to play how you did against us (which is looking more and more like an aberration now due to the opponent and not from an actual caring about defence) and you'll win.