I think what's being lost here is that athletes can peak later in the season, especially in the Olympic season.
I find the argument that Zhou beat Chen and Uno earlier in the season to be extremely flawed. They're both better skaters, it was very early in the Olympic season (meaning they might have wanted to slowly build towards the Olympics), they literally did do much better at their respective nationals, and they both will be doing MUCH better than they did at Skate America at the Olympics. Zhou looks like he is on a downward trend, and won't be doing as well as he did. This is the second time he has cracked under pressure at an incredibly high stakes competition.
Malinin, OTOH, seems to be peaking at the right time. Why, then, shouldn't he be sent, and why doesn't Nationals get the most priority? It's the highest pressure situation before the Olympics, and if you do badly here, what faith can be put into you to do better at a competition that has even more pressure?
Brown skated as well as can, and won't be scored as generously as at nationals, but he can skate the SP at the team event if needed, and he has the argument of "artistry". Still think I'd kick him out if we were to use the tier criteria, but I disagree with them anyway, so I'd kick Zhou.