One small point about Jon’s decision regarding the Umbers and Karstarks. Given that they are the first castles once the walkers get past the wall, both houses are almost certainly getting destroyed and those families will be punished soon enough. Might as well use them to offer the first bit of resistance. Maybe, assuming they get dragonglass, they put a small dent in the walker army before being eradicated. I wouldn’t put my most loyal subjects in that situation.