I know its early days, but every time I watch him, knowing he's very young, I see a defender who is going to be a cut or two above most center halves in the league.
He's so calm for his age, quick, strong, good in the air, anticipates very well, knows when to press the forward and when to simply escort him to the angle he wants him at.
Another thing he does for us is that he gives us the possibility to keep Konate injury free. The lad prone to muscle injuries and so his minutes need to be managed. When rotation was made with Matip it was just a question of time before he got injured and you ended needing Konate for a long stretch of games. Quansah is offering such competent defending that you can pick and choose the important games you want to have Konate in there.