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Great action and everything, but I'm frustrated at the whole angle of Sansa not telling Jon that there is a small possibility that a huge army could help us out if we just wait. The Vale swooping in to save the day at literally the last minute was just too easy.
Looking fwd to the finale
I think Sansa is motivated by a lack of trust in Jon and his advisors to win this fight. Turns out she was right. Jon did screw up. Not necessarily by going after Rickon, but by letting his rage get the best of him and charging alone towards the Bolton lines after Rickon was dead. Then, Davos screwed up by sending their forces after him.
Also, I feel like LF is making all the decisions here. I don't think Sansa is in contact with the KotV. However, I do think LF has spies and scouts tracking the situation. It doesn't look like Royce is there (not with LF and Sansa watching), so if the KotV show up early, they likely get put under Jon's command. LF would rather watch and see what happens before he makes his move.
If Sansa is in contact with LF, then she still has motivation not to tell Jon. Three things could happen and two aren't good. I'm still assuming Jon would command the KotV with no Royce present. Jon could incorporate them into his battle lines, meaning they get slaughtered when Davos sends them charging after Jon (loss). Or, Ramsay could see them, decide the odds aren't in his favor, and withdraw within the walls (long siege). Or, they could hide them in reserve and crush the Boltons after they commit to their game plan (win).
So, it makes sense for Sansa and/or LF to hide the KotV and see how the battle goes. If Jon wins, they learn he is a remarkable battle commander. If not, the KotV can swoop in and save the day. It is a win/win for Sansa and LF either way. Jon and Davos are the only ones that seem to care how many men die.