I think we can move up to 6. Your list plus Yaya and Kolarov. Whatever we do, we need to rid ourselves of Kolarov. He is the weakest link in the chain. Perhaps weaker than Demi.I don't doubt we need to do it. Just shifting players is always going to be difficult because of the contracts we have them on.
I expect something along the lines of 4 in 4 out and then loan returns.
In terms of improving us by substraction: Kolarov, Demi, Yaya and Kolarov. Those 3 must go for us to improve. Everyone else could play a part and still be fine. Sadly Kompany is #4 in my mind. As he negatively impacts us by getting injured and forcing a breakup in the CB partnership, only to come back and breakup whatever was developing while he was out.
It better we find 2 starters who play mist games and get them to develop from the beginning.
But that's the unemotional tactician in me. I expect the team to keep him though. Great service and all. But he shouldn't be Capt. That way he doesn't have starting rights. Play him as needed.