Soldo is definitely not untouchable but you also have to consider the cost of a replacement, if you want a more mobile type then you would probably need to spend up. As to your question of depth in the top tier, I think Melbourne are tops, Geelong pretty good with Blicavs as their relief ruck, Doggies have English & Sweet with Stef Martin the third in line. Collingwood have Cameron & Cox, Sydney have Hickey & Ladhams, Fremantle have Darcy & Meek. Without wanting to labour the point, I don't think you can run a locked & loaded campaign with a second ruck who's on a learning curve, even if you are only banking on coverage for a few games, you are still putting a top 4 place at risk. Can't afford too many slip ups & given Nank has missed a fair bit of footy the past 4 years I think there's a fair bit of complacency setting in.