This from Simon Hughes and Raphael Honigstein gets at how the decision regarding Werner has more to do with the next great challenge for Klopp after the fantastic work he has already done for Liverpool:
"Crucially, Klopp had concluded, the prospect of a new challenge was within the framework of an environment he’d already fostered: the rebuilding job to come after this current team’s cycle is done. He realises the trick is not to make it seem like a rebuilding job at all, rather a smooth transition from one to the next: where outstanding players are replaced by other outstanding players ready to carry on their good work.
He recognises the conditions at Liverpool are there for him to do what Sir Alex Ferguson did at Manchester United and what Arsene Wenger did at Arsenal, albeit to a lesser extent because he does not see himself still managing Liverpool a decade from now. He believes he can build a second great team — something he has not managed in his previous jobs, and nor has any other German coach working abroad."
Understand that the authors are not saying the first great team is done, but that good planning requires laying the groundwork for Klopp's Liverpool 2.0, piece-by-piece, with that work already beginning. Werner could be an important part of that.