I dont see them cutting LSH, they have made Brienne such a major character and adding that she let Arya slip through her fingers cuts part of aFoC for her in half
I thought LSH would be in last night but it does make sense to hold it back further, she appears at the end of aSoS and then not again until the end of aFoC unless I remember incorrectly
my new guess (every other LSH guess has been wrong so far)