(Sorry I'm late to the discussion, been offline for a bit..)
Personally I'm starting with Goldy and probably Stef Martin at this stage - yep, the 2 most expensive rucks but I think given their endurance etc they're likely to benefit from the drop in rotations, and I'm personally leaning towards Set & Forget this year. My thoughts FWIW:
Goldy - true he's expensive priced at his ~129SC average - but he came home like a TRAIN last year - averaged 143SC over his last 14 games - gives me some comfort he could at least go close to backing up in 2016. "Only" 27yo and still in his prime..
Stef - also on the expensive side (naturally) priced at his ~111SC average - but he averaged 118SC in the games he played without Leuenberger, and given Trent West is injured as usual (though haven't seen an estimated recovery timeframe anywhere), Stef might be solo for a large chunk of the season this year..
Mummy - I just can't go there myself - never played more than 19 games in a season, missed on average 5.6 games over the last 7 years. Huge potential, could average 120 potentially but just can't trust his body, or that he won't get reported the way he throws himself around..
Leuenberger - same thesis as Mummy (though Leuenberger is nowhere near as good) - missed 46 games in last 4 years. Glad to see his ownership is down to 16% (from 21% a couple weeks back). Best is only 102 average way back in 2011 - priced at 58 I can't see him averaging more than 90 - which was the 10th best ruck in 2016, or only the 23rd best FWD (for those considering him for the FWD line). Leuenberger probably won't ruck solo, while TBC (*shudders at memory of him stinking up my FWD line in the abysmal R/F experiment of 2015*) is out, McKernan (handy over his 9 games last year) is still there - and the fact the Bombers picked up Grimley (seems likely to play) and Jamar (probably insurance only) suggests they don't think Leuey can hold up and/or ruck by himself. Would much rather invest in a FWD rookie instead who should give a much better value return - a $124k FWD rookie (priced to average 23) only needs to average 55 to give the same return as Leuenberger averaging 90 at his price..
Lobbe - would be keen to understand what Lobbe's career best ~101SC average from 2014 translates to in the new rucks scoring system (??).. but personally just don't rate him - seemed to struggle big time to outmuscle Jarrad Redden in Port's side a few years back, and if Redden wasn't so injury prone Lobbe might not be Port's #1. Reasonably favourable draw to start the season though for those looking to use him as a stepping stone..
Jacobs & NicNat - the other 2 rucks i'd seriously consider.. Sauce: "reliable" from a year-on-year viewpoint and has averaged 115 before (2014) but can put in stinkers - evidenced by 6x scoring 73 or lower last year.. NicNat is cheap if he can average 114 again (2012)..
Sandilands - can't go there given he's 33yo now - bad memories of Dean Cox's fall away in his last year (2014), and saw speculation in the offseason this could be Sandi's last year..
Blicavs - love him as a player but difficult at that price given plethora of rucks now at the cattery - higher risk/high reward play IMO..