I think ice dance is a bad example. Without the difficult jumps, ice dance is the one discipline that is fairly predictable. With singles, it is a lot less so. It is not unheard of for a singles skater to have the "skate of her life" at the Olympics and defy all predictions--hello, Adelina and to a slightly lesser extent, Sarah Hughes. There have been surprise medalists who over-achieve at the big event among the men, too--Denis Ten and Paul Wylie are two who come to mind. I think the weight should go to the standings at Nationals. If someone can't perform at this big event, why should we expect them to do so at the even bigger event? And even if they can, are they really medal contenders? I can't even think of a past situation where not going with the top 2 or 3 who were eligible would have been a better choice--except in the case of a skater missing Nationals because of injury and being a gold medal contender (Nancy Kerrigan, Michelle Kwan).
Ross:
Last season: 9th/10 at Cup of China, 12/12 at Skate Canada, 6th/13 at US Classic (Senior B)s; 5th at Nationals.
Not exactly a stellar showing, then better at Nationals. And I don't buy the "it's early in the season" excuse for his GP performance. Other people showed up and competed better.
At Cup of China, he scored 213.
At Skate Canada, he scored 196.
At US Classic, he scored 214. (Rippon was at 248.)
At US Nationals, he scored 240.34.
This season: 6/10 at SkAm, 6/14 at Autumn Classic (Senior B), 6/18 at Finlandia (Senior B); 2nd at Nationals.
Meh showing at his one GP (He scored 219. Rippon in 2nd was at 264.)
At the Finlandia, he did a bit better, but still behind Rippon. (He scored 233; Rippon scored 249.)
At the Canadian Classic, he scored 219. Bronze medalist was at 248 (Keegan Messing

)
GREAT program at Nationals - 274.51.
Sesame Street used to have a little ditty: "One of these things is not like the other; one of these things just doesn't belong." Ross's 2018 Nationals score is a classic outlier. Unless Nationals is the ONLY comp that counts, it is hard to look at any analysis where you don't see 2018 Nationals as more likely a fluke than not.