So come on .. name them. You keep saying they are out there but I've yet to see anyone, on any thread and on any forum that I've been on, come up with a really viable option that meets the criteria below. You are totally hung up on his fee (or on a multi-thread, multi-week troll) but just forget that for a moment and concentrate on exactly who was available, and just as importantly would have chosen to move to Liverpool (this rules out some big name CBs before this gets silly)? And don't say Maguire because he clearly isn't as good no matter that you alone seem to think he is (mostly, it seems, based on his potential).
Also remember that Klopp wanted a dominant leader (i.e. not Bailly), a player who could carry the ball out of defence, was aerially very strong and is at or close to his prime now to improve the defence from Day 1. And, I'm repeating this for emphasis, remember they have to be better, not just younger and with potential.
On your marks, get set : GO ! ......... (this may take a while folks so don't hold your breath).