KDB is just a big game player but he's allowed lose the ball more than anyone else in our side so it allows him to be braver I find than someone like Bernardo who kinda gets switched into workhorse mode vs you guys (almost 12.5k covered in the match yesterday). Our team in general are very press resistant but Rodri is the one who can be got at sometimes and overwhelmed more so than even our CB's. I thought Klopp would play Firminio to drop and sit on him yesterday.
It would nerf your attacking somewhat but if you had one fullback with Walkers pace you'd be pretty much unstoppable, because your one weakness is when you get turned in behind. City were preparing for that the last 2 matches. We have Walker to bail us out when that happens, for all the defensive talents you have, that recovery pace is what you lack (which makes your high line even braver).
Walker is ideal at making up that ground, even against dudes like Mane and Salah (he's not vastly quicker but when they are running with the ball, he can eat up the ground, in a straight up foot race running on to the ball, he's only marginally quicker so chances like the goal yesterday are beyond him), if only he could cut out the occasional brain farts and be switched on for the entire game he'd be a truly world class defender. Trents tekkers and Walkers physical attributes would probably make the perfect fullback.