I'm not sure I *actually* believe this theory, but I still think that the person who made the video spent a LOT of time nitpicking scenes and putting this together. I just thought it was a cool video, and that they present a very convincing argument.
Also, Loony BoB. The two Lannister cousins you're referring to (the little boys killed by Karstark, right?) were not Stark captives at that point. The Starks didn't take them until this season.

