Which you could say tells you one of a couple of things. Otherwise, the club would have gone in and signed Cucurella no matter what, paid what it takes and got him in, when they did that with all the other targets.
Either the club aren't really in the market for a LB and are intereated in Cucurella or others down the list purely as a replacenent should Zinchenko leave.
Or Brighton are looking for too high a value, and the club are happy to be patient and stick with what they have, unless their arm is twisted by something like Zinchenko leaving.