Isn't that why there is such a raging debate. Because nobody quite understands what Klopp is doing here.
I think the one thing we can conclude about Klopp's view is that tactically, Moreno is doing pretty much what he wants him to do - or he wouldn't keep picking him, he would have put a higher priority on signing a LB. We still get posts about wanting a more 'solid' player at LB, who doesn't get forward or doesn't do so so early in a move. But we don't see Klopp go beserk on the touchline when Moreno starts sprinting right at the start of a counter attack.
On a related note, we saw Clyne yesterday playing quite differently than he did for much of last season in possession - much more regularly simply taking on his opponent for pace rather than stopping and laying the ball inside. The indications from that might be, comparing the two fullbacks, that Klopp wants Clyne to be more positive, rather than getting Moreno to be more cautious.
Moreno has good ball skills and top class speed, agility and stamina in that role (for which those are key attributes). He's - very - prone to certain types of mental error - switching off, losing his man, rash challenges. He made some progress in addressing those last season, but reverted at the end of last and the start of this.
So essentially I think Klopp wants a LB
like Moreno; but with better focus, concentration and consistency. It seems he still has some belief that Moreno
might improve further on those qualities, but certainly knows he needs competition and has been looking to sign the right player (not any player) to do that in the long term.