Don't really get the problem with him joining Liverpool.
For me he doesn't get into the attack ahead of Firmino, Mane, Coutinho, Lallana and he doesn't get into the midfield ahead of Henderson, Can, Milner. And even if he can get in it, I doubt very much that he improves it without a lot of personal development (which could happen).
I'd rather he went there for 30m than somewhere else for 20m.
Just because he's put together 5 decent games as a midfielder this season doesn't mean he's suddenly a top midfielder. He's been pretty mediocre for at least two years now.
If he's the easiest one to sell then sell him. The only way we're going to get the required amount of new blood in is if players leave. I'd happily see Ox and Ramsey force their way out this summer even if other players have to stay.