they know the books, now the end, and have probably a broad idea of how will they fill the gap between both
golden company have been mentionned several times before season 8, so if they planned to give importance to golden company, they should have build more background
but yes, maybe in previous seasons they weren't sure of how to portray golden company, if they will break contract to join Targaryen or if they would play a role at all
In the TV Series we see Arya wear various faces, initially the faces seem to be similar to her, young females that she could easily take on the mannerisms and possibly learn to put a voice on for. The faces she wears here we have never seen before and so can't compare the voice or mannerisms to t...