Nah I am pretty certain the structure will be:
4. Setup and talking episode with maybe a bit of showing some consequences of the war against the dead
5. Big war good guys vs Cersei and a cliffhanger
6. Cersei loses and is killed by Arya. Everyone is happy. Arya sails to the land in the east and Sam finishes the episode with writing "The Lord of the Rings" "A Song of Ice and Fire"
I agree. Somehow a new army will materialize for Dany and company and corner the Golden Company into King's Landing. Arya, the Hound and Jaime sneak in, and Cleganebowl, Valonqar etc. happen. Perhaps King's Landing is blown by wildfire. Jon and/or Dany rule, the last monarch to gain the Westerosi throne by force, mimicking the War of the Roses. Ghost makes two cameos in episode 4 and 6 respectively.