posted by gut
I keep trying to think how this all plays out. If they eliminate the Night King, how will they have anything left to defeat Cersei's armies? If Dany still has Drogon she still has a weapon of mass destruction. She and whatever forces remain keep Cercie's forces occupied while a small force, shown the way by Tyrion and/or Arya, sneaks into the Red Keep tasked with two things; taking out Cercie and any scorpions. If the Night King is still around can the Golden Company/Lannister Armies fight a two front war?
1) Arya assassinating Cersei seems just too easy and convenient. See above
2) Interesting theory I saw was the Night King is actually going to take out King's Landing while Team Winterfell is distracted fighting [most of] his army. Remember, Dany had a vision of the Iron Throne in cold, snowy ruins....Looking back, too many other hints to dismiss this idea. Right vision but wrong baby and wrong baby daddy?
3) The Golden Company "has famously never broken a contract", which might balance the scales. Otherwise, even with Dorne I don't think it would be enough. There is a first time for everything, If Cercie goes "Mad Queen" and threatens to burn the city and take out the Golden Company with it? If I was Jon Connington I'd put a sword thru her.
Some combination of all 3 would be fun. The Golden Company suddenly switching sides would feel contrived. But if they are already marching north, then they conveniently aren't wiped out by the Night King and provide needed reinforcements.