Aurier is better than Tripps, not perfect and we can do better than him but he much better than Tripps. KWP is probably on par with Tripps right now, but I've watched him for years and I hope a run of games will make him comfortable and more confident, he's better than Tripps at taking on the oppo, he also gets up and down the pitch better (Tripps simply didn't track back when he was up the pitch). I doubt if he has the stamina to do this all game, we will see. He can play out from the back better than Tripps, this is good for balance. He does need to work more on his positioning and closing down the oppo better, but Tripps was also shit at this, in fact, I'd still that KWP has better recovery that Tripps, there may be a penalty given away because of it but I prefer to t=see a defender trying to defend than not even bother waving his hands in the air on the edge of the box. On balance they are all better than Frodo, two with higher ceilings worth investing time in.