I gather your “120” benchmark set for the above is in relation to the top two averages for the position from last season rather than anything else, as it seems to be a very unrealistic benchmark. Witts perfect scenario has already been and he couldn‘t even top 110. Lack of a ceiling due to not possessing the ideal SC ruck style (involvement around the ground, scoreboard impact, etc) with only 8/59 140+ in the past three seasons.
Is there a reason why the 150 or 159 are not being excluded along with the 58 for Nankervis? Just be careful that if extrapolating RD10 onwards that the expectation is that the scoring range in question will continue with more high ceilings and the floor set to 100 over the length of a full season. If the 58, 150 and 159 was replaced with an injury free 128, 124 and 115 would this change his prospects in any way for the upcoming season and “perceived” upside?
119.37 is the top 2 ruck average for the last 7 years, I round up but that's the ballpark target in a normal season and you're not competing without top 2 ruck scoring, especially now with a billion trades. If I don't think a premium priced player can average that level, they're not worth considering unless there's some monumental rule change that I think will change the scoring levels. Even better if I think they're 130+ potential because then I can miss by a lot more and still be ok. For example, I like Sweet as a player but similar to your complaints about Witts, I would say the same of Sweet, he just doesn't do enough of the extra SC things for me to think he's capable of anything more than the 105-110 region, he might add those traits yet, but for now I wouldn't pick him for that reason. Meek, Nank, Cameron, Darcy, Jackson (sole ruck), Briggs and TDK are all guys I can actually make the case for and believe it, not saying I would or that I don't believe the against case more, just that I can see the ceiling to plausibly be a top 2 level scorer. There are always exceptional seasons, take Gawn out and that top 2 average drops a long way just as an example but assuming he's there, the target for top 2 is 120, imo.
The only game I removed was the game where he was injured and then subbed off, every other game is just a full game sample and I also left in the average with that score in to be clear of its impact. You're not picking a premium if you expect them to be subbed off during the season, it's evidence that I definitely mentioned regarding his durability. If that game hadn't been a sub affected game then I'd have left it in there.
I used R10 onward simply because he was one of the slowest to realise the advantage that the new ruck rules gave him and how to do that. Xerri was another who didn't really seem to get it straight away, Gawn luckily got the baptism of fire from Grundy in round 0 and was very quick to pick it up on the contrast. It's logical that a rule favouring strength and minimising leap would lead to higher scoring for the strong rucks that don't jump so well. Xerri and Nank both great examples. ROB and Grundy also examples, ROB another to take a long time to really work out how to use it and Grundy one who exploited it heavily early in the season before other teams kind of worked him out a bit.
That the likes of English, Stanley, Draper, Bailey Williams and Reeves all struggled so much as the weaker and more jump reliant rucks is another supporting piece of evidence. It may flip completely this year and prove to be purely a flash in the pan but it's definitely a trend I noticed last year, admittedly not really watching very closely compared to normal.
All just theory at the end of the day, TDK could come out and average 130 and obliterate the theory but I think Nank putting up a career year that trended upwards as he adapted is at least worth pointing out.