Sneaky little details... Sansa and Jon

[imp-ty]

Didn't Rob legitimize Jon right before the Red Wedding? If so, where did the document go?

In theory, this puts Ramsey and Jon on equal footing "bastardwise" and would significantly affect Jon's ability to rally support. However...

How many of the Northern houses would side with Ollie et al regarding bringing thousands of wildlings south of the wall? The North remembers them too... Will Northerners fight alongside wildlings who are being commanded by a former LC of the Night's Watch who isn't technically a defector because he is a zombie, but different than the army of zombie/wights that are coming soon from the north and led by those WW guys your wet nurse told you about in fairy tales... isn't unreasonable that there may be a bit of pushback...

Sansa may have been a Stark, but she is now Lady Bolton nee Lannister... Technically, isn't she is also Wardeness of the North? Does it really matter though if Lord Lucifer Bolton will just lock her away and do unspeakable things to everything but her uterus and face if he finds her?

LF has used Sansa as a pawn multiple times already (poison necklace at purple wedding, Bolton bride, shady-ness at the Vale with Robin and Lysa). Why would she trust him enough to let Jon lean on an army of Vale Knights who would be more likely to betray than help? How would she know that the Knights were not just another necklace or Trojan Horse that would be used for LF purposes once she helped to get them into WF. Seems reasonable that she would question everything and assume (if she's smart) that nothing is free and she's being manipulated again.

She saw what happened when LF was supposed to have delivered the Goldcloaks to protect Ned during his first confrontation with Cersei in Season 1. LF promised Ned troops and turned them around to betray him. It makes perfect sense not to tell Jon about the Vale Knights at MC. They are a sword without a hilt and better left out of the picture unless absolutely necessary. Jon hasn't seen any of the drama down south and Sansa and Jon have not seen each other in years. It does make sense to keep cards close to the wolf adorned vest until she is absolutely sure of who she can trust. Season 1 Sansa thought she could trust Cersei and Joffrey (new family) and didn't understand the depth of her betrayal to Ned until it was too late.

In this world, bastards are viewed as untrustworthy, ect. Jon hasn't done anything extraordinary with Sansa specifically to demonstrate just who post-resurrection Jon is... The smartest thing Sansa could do is to limit her vulnerability because every man in this story has mistreated her (even Ned killing Lady to appease the King). 

Any other sneaky details come to mind?