Cuadrado is a fantastic sub and he seems to have his head set on right, so if he's comfortable riding the bench for most of the season then keep him. He's lost his place as a starter due to poor form and better players arriving, but his unpredictability and insanely clutch moments in big games is a fantastic asset, because it will keep the likes of Berna and Costa on their toes and make everyone fight for a spot in the starting XI. If we keep the 4-2-3-1 he will get plenty of opportunities to show what he got.
If we get a 35m+ offer though, then it's hard to say no, since that money would get us superior players like Schick and Keita, or better yet fund a move for a big name mf.