look... everyone is different. 1. klopp consistently says lb is a specialist position so if you are a specialist then its one slot or no slot. 2. we have also heard that Moreno impresses in preseason and he was there all preseason. 3. we also heard klopp say Robertson was for future. 4. Robertson started off crossing everything which gives ball away in our team. Robertson got one game then none. obviously klopp decided to work on him. so...... thats it imo. klopp has given him the benefit of his coaching and he responded. now he is team.
It just goes to show how brilliant Klopp is that Robertson (and Matip) has developed beyond all recognition.