I finally did spot the wayward pass TFM made in the Tottenham match. About the 52nd minute...no pressure and launched a lazy ball back to Spurs' CB. Ok, but it was only one wayward pass under no pressure. But from what we've seen so far his game is nearly perfect and well, well beyond anything you'd reasonably expect of a teenager, especially against two very decent sides in Spurs and West Ham.
The question is what to do with TFM in the short run. Let's be honest...Fosu-Mensah is a significant upgrade on Darmian, who looks more and more like a squad man with every outing. Keep playing him at RB and go ahead with a CB buy this summer.