Henderson is a very good example in that list. He's not skills triple A, his utility is though. Imagine if someone could get that out of a very creative close to feet player?
He needs a system that he knows instinctively. That players will be moving into 'that' space instinctively. Attack the gaps. Close the options when pressing.
The whole team team needs to re-learn this.
I think one of the major drop off points since Klopp is down to not running as much in training. Their fitness is sh!t. If they can't cover the ground, they can't press properly and fill gaps.