The only reason the committee is even in the position of having to choose is because the U.S. failed to earn a 3rd spot, and while any other team might have flubbed the opportunity as well, the team that failed to get it done was Shin and Nagy. So I really don't see an argument for choosing them over Chan and Howe, who have higher season's best scores and beat Shin and Nagy at nationals, even if just by a hair.
Far be it from me to ever give anyone a reason to argue on behalf of ShiNagy for the 2nd spot but they actually have the higher SB.
ShiNagy - Golden Spin - 194.00
ChanHowe - Trialeti - 193.70
Mind, the field at Trialeti was much deeper/tougher than the one at Golden Spin, and ChanHowe have beat ShiNagy in BOTH of their public head-to-head match-ups (John Nicks and Nats), plus ChanHowe have the higher average score from the Challenger/Sr B assignments, more points in the Selection Pool Calculation, and a higher current season World Ranking, but ShiNagy do have the teensiest of edges in highest SB score.
Also, a lot of people are arguing that ShiNagy have the edge on scoring trends because of that Golden Spin score & the fact that their scores kept going up from September through the end of the fall season whereas ChanHowe were trending downward. I'm not sure how much weight I give to that data point though, for a couple of reasons.
1) ChanHowe's starting score from John Nicks was 183.22 and their low, at the end was 180.02 from SkAm, with scores of 193.70 at Trialeti and 187.40 at NHK. So, their scores stayed in a fairly narrow window and their lowest score came on a week they were competing back-to-back with travel from Japan to Lake Placid thrown into the mix. If they'd had any other 2nd GP assignment, it seems reasonable to conclude they probably would have scored higher than they did at SkAm. Additionally, that low score came at a GP and we know that scores from the GP tend to be more strict than at Challengers & other senior Bs.
2) ShiNagy started with a 170.77 at Glacier Falls, then 167.xx at John Nicks, dropped to 158.xx at the OQE, then rose to 173.40 at GPdF, 179.25 at IceChallenge and finally that 194.00 at Golden Spin. Yes, there is a clear upward trajectory, but even discounting the horror score that is that 158.xx from Skate to Milano, they still started with a much lower score than ChanHowe at the same competition, so it was almost impossible for them to NOT improve their scores as the season wore on, and it still took them until Golden Spin to post a score that was better than ChanHowe's LOWEST season score. And their only GP score is 6.5 points lower than ChanHowe's lowest score from the GP. The scoring range for ShiNagy is a LOT bigger than ChanHowe's and that Nats FS demonstrated exactly why this is the case.
We'll see what the Pairs Subcommittee values when the decision is announced, but it's tough for me to see much of an argument beyond "future potential" and that's not something that usually moved the needle in past decisions. It's really hard to argue with the results from two head-to-head match-ups this season, IMO.