Tywin's/The Lannister role seems to be common knowledge from all the players. Even if they don't know, it was the Lannister's who crippled Bran and chopped off Ned Starks life, and held the Stark girls hostage.
I can't see how they'd be willing to serve a Lannister (Sansa/Tyrion's son) any more than a Bolton (Sansa/Ramsay's son). Both plans had someone with the last name of an enemy, but direct ties to the only remaining Stark.
Well others have suggested that this deviation from the books was bad writing cuz it made no sense. That's what I thought you meant when you said it was a bad plan.
I agree wholeheartedly it won't work. Bolton won't win. He can't win. He sealed his fate at the Red Wedding. But what would be a better plan for Bolton? You suggested he should wait for a "flawless" plan, what could be a better plan than gaining an allegiance with the only living Stark?
y'all still aren't getting it... they aren't marrying them like "hey if we get them married and have kids, everyone will LOVE us"
they are marrying them like "if we marry her and have a kid, well how the hell can they rise up against us, when a STARK will be calling the shots"
look at littlefinger... they didn't care he was married to Liza... they was about to kill that nikka until sansa stepped in like "i'm a stark and i say he's cool"
so when tyrion/ramsey would be like "pay your taxes bytch" and the people would be like "fukk you nikka" then sansa (or her child) would come out like "nah i'm a stark with stark blood, pay your fukking taxes nikka"
at that point, a revolt against sansa's husband, would be a revolt against sansa since she'd be all up in the crib, fukking that nikka... of course this plan only works if sansa becomes the willing puppet... but i'm sure threats against her life will have her doing that with no problems... or so they believed.. they have no clue littlefinger been training her... matter of fact, 99% of the realm has ZERO clue littlefinger has been behind ALL of this the whole time
thats why houses marry to each other.... to form that FAMILY bond that should make permanent allies
king robert wanted to marry the starks to his name for that
the sent the little girl to dorne to marry so dorne would be on their side
marg getting passed around, trying to marry into power
frey was pissed he couldn't get married into the starks... married into the boltons instead
just think about it... you have a daughter... you'd want her marrying bill gates or some shyt... only so YOU can walk up in the gates/ house like "heeeeeeeeey this MY family too... break me off something cousin" "nah don't buy out my company microsoft, me and bill is cousins now" "man i want to fukk bill up but his son is married to my daughter so i can't even take it there"