Ake is a PL winner who has played 27 times for his country. Cucurella has won nothing and played once for his country. Its not really comparable currently. Plus Chelsea are a PL rival and Ake is classed as homegrown so of course we're going to charge a premium for Chelsea.
Its a game of poker going on at the moment, we'll see who blinks 1st. I'm not too optimistic at the moment and get the feeling we'll walk away in the end, but we'll see if Brighton are willing to accept a bid of around £40m as thats where I suspect City will go to.