It really doesn't matter who the USA puts in for the Men's TE FS between Naumov & Torgashev unless both of them skate far better in that segment than they've done so far internationally this season. Both of them have an average FS international score this season that puts them last in the TE FS regardless of whether France or Canada makes the FS/FD segment. If Italy splits the men for the TE and puts Rizzo in for the FS segment, then maybe one of the US men can beat him, but that's not anything I'd be willing to bet on, and the likelihood of beating Gogolev in the TE FS is even lower. I'd give it 50/50 odds of beating Aymoz in the TE FS.
Here's the data I'm looking at - I'm not considering domestic competitions (Nats, French Masters, NQS, Japanese Regionals, etc) since domestic score inflation is a known phenomena (most recent score listed first, oldest score listed last):
Torgashev - 136.26, 161.84, 152.19 - season average = 150.10
Naumov - 148.51, 153.89, 151.47, 146.72 - season average = 150.15
Rizzo - 168.37, 153.22, 150.80, 153.49, 166.94, 126.72 - season average = 151.45
Aymoz - 152.00, 159.97, 142.64, 168.41 - season average = 155.76
Gogolev - 164.26, 150.35, 167.87, 164.59 - season average = 161.77
Sato & Egadze are WAY ahead on their season average score and it's hard to imagine a world in which they don't finish 1-2 in the TE FS. Both Siao Him Fa & Grassl are also behind Sato & Egadze, with Siao Him Fa being the closest to Egadze (less than a point separates them) and Grassl being about a point higher than Gogolev.
But, as far as the US goes and the points given up in the TE Men's FS segment alone, it truly will not matter which of the other two is used. We use one of them and we lose the gold medal to Japan by 1 point or 0 points on the tiebreaker - and that also doesn't matter if it's France or Canada in the FS/FD segment, presuming we also split ice dance.
The only way a TE gold is guaranteed is if the US does NOT split men & ice dance.
As far as the women go, if I were Japan, I'd put Chiba in the SP and Sakamoto in the FS. For starters, Sakamoto has the flag bearer duties the same day as the TE Women's SP. Second, Chiba has the highest SP average of the three Japanese women while Sakamoto has the highest FS average of the three.
If that's the line-up Japan goes with for the Women, Liu is the best choice for the US in the SP as she has a higher season average than anyone else in the world. Glenn's SP average is lower than Chiba, which is another potential point given away to Japan. For the TE Women's FS, it doesn't matter who the US uses - their FS averages are lower than all three of the Japanese women. Glenn comes closest but her FS season average is still 5+ points lower than Sakamoto's.
Pairs continues to be the weakest link for the US. We're in a better position if Italy splits, which they may do, but it's still looking grim because the depth of the TE Pairs SP field is pretty much impossible for KamO to overcome. They're finishing 6th in the SP unless there's another 2018-esque TE Pairs SP debacle where Alexa & Chris finished a shocking 3rd in another deep field. And when I say they're finishing 6th - their SB for the SP is lower than the lowest SP score of the five teams who will finish ahead of them - MiuKih, MetBeru, ConMac, SuiHan & SDDes.