Scream is obviously a good choice. That being said though, I really hope they keep Mixwell.
People talk some smack about him, but Mixwell on their ECS matches, played well most matches for IEM although there was 1 where he didn't do great, but at the same time neither did apeX. I want them to keep that extremely strong double awp CT side. Thats where they need to bank their money. Mixwell has shown he can do T perfectly fine along with the others as well. Maybe not as well as Scream though, either way you trade out.