Update: I know it's only an hour and some after we got them in the brooder, but already massive massive improvement. Ugh. I'm so relieved. They're ALL steady on their feet now. The one that was open mouth and looked almost like it had been 'spitting up' in its mouth, I did a gentle crop massage as its crop seemed full and it is now not open mouth breathing, is drinking fine on its own, and looks tired but no longer was looking like it was actively dying. It no longer seems to be regurgitating whatever was going on. That was scary. :[ I hope that was the right call...
They were all SO wobbly when we first put them in, like they were drunk. </3 But now they're all steady on their feet after making sure they all got a direct drop of nutridrench and a bit in their water. So, fingers crossed... I know shipping can be tough on any chicks, especially Bantams. But ugh. Hadn't had this before with shipped chicks so was definitely panicking. Gonna keep checking in every 15 minutes for a couple hours to be sure everyone's still good.